Fix parental-agents documentation

There is a missing string "net" in the ARM in the parental-agents
example.

(cherry picked from commit 8d75ec83)
79 jobs for !5305 with 2836-parental-agents-documentation-missing-string-net-v9_16 in 46 minutes and 30 seconds (queued for 7 seconds)
latest detached
Status Job ID Name Coverage
  Precheck
passed autoreconf #1892891
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passed clang-format #1892893
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passed coccinelle #1892894
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passed danger #1892895
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passed misc #1892892
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passed tarball-create #1892896
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  Build
passed clang:asan #1892910
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passed clang:buster:amd64 #1892914
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passed clang:freebsd12:amd64 #1892917
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passed clang:freebsd13:amd64 #1892918
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passed clang:openbsd:amd64 #1892919
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passed clang:tsan #1892912
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passed gcc:alpine3.14:amd64 #1892897
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passed gcc:asan #1892909
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passed gcc:bionic:amd64 #1892907
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passed gcc:buster:amd64 #1892901
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passed gcc:buster:amd64cross32 #1892902
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passed gcc:centos7:amd64 #1892898
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passed gcc:centos8:amd64 #1892899
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passed gcc:focal:amd64 #1892908
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passed gcc:mutexatomics #1892913
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passed gcc:out-of-tree #1892904
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passed gcc:sid:amd64 #1892903
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passed gcc:softhsm2.4 #1892915
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passed gcc:softhsm2.6 #1892916
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passed gcc:stretch:amd64 #1892900
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passed gcc:tarball #1892905
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passed gcc:tsan #1892911
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passed gcc:tumbleweed:amd64 #1892906
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passed msvc:windows:amd64 #1892921
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passed nolibtool:sid:amd64 #1892920
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  Unit
passed unit:clang:asan #1892933
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passed unit:clang:buster:amd64 #1892937
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passed unit:clang:freebsd12:amd64 #1892940
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passed unit:clang:freebsd13:amd64 #1892941
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passed unit:clang:tsan #1892935
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passed unit:gcc:alpine3.14:amd64 #1892922
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passed unit:gcc:asan #1892932
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passed unit:gcc:bionic:amd64 #1892930
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passed unit:gcc:buster:amd64 #1892926
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passed unit:gcc:buster:amd64cross32 #1892927
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passed unit:gcc:centos7:amd64 #1892923
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passed unit:gcc:centos8:amd64 #1892924
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passed unit:gcc:focal:amd64 #1892931
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passed unit:gcc:mutexatomics #1892936
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passed unit:gcc:sid:amd64 #1892928
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passed unit:gcc:softhsm2.4 #1892938
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passed unit:gcc:softhsm2.6 #1892939
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passed unit:gcc:stretch:amd64 #1892925
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passed unit:gcc:tsan #1892934
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passed unit:gcc:tumbleweed:amd64 #1892929
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passed unit:nolibtool:sid:amd64 #1892942
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  System
passed system:clang:asan #1892954
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passed system:clang:buster:amd64 #1892958
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passed system:clang:freebsd12:amd64 #1892961
amd64 libvirt

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passed system:clang:freebsd13:amd64 #1892962
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passed system:clang:tsan #1892956
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passed system:gcc:alpine3.14:amd64 #1892943
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passed system:gcc:asan #1892953
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passed system:gcc:bionic:amd64 #1892951
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passed system:gcc:buster:amd64 #1892947
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passed system:gcc:buster:amd64cross32 #1892948
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passed system:gcc:centos7:amd64 #1892944
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passed system:gcc:centos8:amd64 #1892945
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passed system:gcc:focal:amd64 #1892952
amd64 linux

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passed system:gcc:mutexatomics #1892957
amd64 linux

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passed system:gcc:sid:amd64 #1892949
amd64 linux

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passed system:gcc:softhsm2.4 #1892959
amd64 linux

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passed system:gcc:softhsm2.6 #1892960
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passed system:gcc:stretch:amd64 #1892946
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passed system:gcc:tsan #1892955
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passed system:gcc:tumbleweed:amd64 #1892950
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passed system:nolibtool:sid:amd64 #1892963
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  Docs
passed docs #1892964
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  Postcheck
passed cppcheck #1892968
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passed flake8 #1892965
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passed gcov #1892969
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76.0%
passed pylint #1892966
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passed scan-build #1892967
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