Fix TCP high-water release note

Add missing GitLab issue number to the TCP high-water release note and
put it in the "New Features" section where it belongs.

(cherry picked from commit d0a3273d)
62 jobs for !2542 with 1206-fix-tcp-high-water-release-note-v9_14 in 2 minutes and 22 seconds (queued for 6 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #401093
amd64 linux
🐞:sid:amd64

00:01:00

passed #401091
amd64 linux
autoreconf:sid:amd64

00:00:59

passed #401092
amd64 linux
misc:sid:amd64

00:00:28

 
  Build
canceled #401106
amd64 linux
asan:sid:amd64

canceled #401110
amd64 freebsd
clang:freebsd11.3:amd64

canceled #401111
amd64 freebsd
clang:freebsd12.0:amd64

canceled #401112
amd64 openbsd
clang:openbsd6.5:amd64

canceled #401107
amd64 linux
clang:stretch:amd64

canceled #401108
i386 linux
clang:stretch:i386

canceled #401094
amd64 linux
gcc:alpine3.10:amd64

canceled #401105
amd64 linux
gcc:bionic:amd64

canceled #401100
amd64 linux
gcc:buster:amd64

canceled #401095
amd64 linux
gcc:centos6:amd64

canceled #401096
amd64 linux
gcc:centos7:amd64

canceled #401097
amd64 linux
gcc:centos8:amd64

canceled #401103
amd64 linux
gcc:fedora30:amd64

canceled #401098
amd64 linux
gcc:jessie:amd64

canceled #401101
amd64 linux
gcc:sid:amd64

canceled #401102
i386 linux
gcc:sid:i386

canceled #401099
amd64 linux
gcc:stretch:amd64

canceled #401104
amd64 linux
gcc:xenial:amd64

canceled #401114
amd64 windows
msvc:windows:amd64

canceled #401113
amd64 linux
nolibtool:sid:amd64

canceled #401109
amd64 linux
pkcs11:sid:amd64

 
  Unit
skipped #401127
amd64 linux
unit:asan:sid:amd64
skipped #401130
amd64 freebsd
unit:clang:freebsd11.3:amd64
skipped #401131
amd64 freebsd
unit:clang:freebsd12.0:amd64
skipped #401128
amd64 linux
unit:clang:stretch:amd64
skipped #401115
amd64 linux
unit:gcc:alpine3.10:amd64
skipped #401126
amd64 linux
unit:gcc:bionic:amd64
skipped #401121
amd64 linux
unit:gcc:buster:amd64
skipped #401116
amd64 linux
unit:gcc:centos6:amd64
skipped #401117
amd64 linux
unit:gcc:centos7:amd64
skipped #401118
amd64 linux
unit:gcc:centos8:amd64
skipped #401124
amd64 linux
unit:gcc:fedora30:amd64
skipped #401119
amd64 linux
unit:gcc:jessie:amd64
skipped #401122
amd64 linux
unit:gcc:sid:amd64
skipped #401123
i386 linux
unit:gcc:sid:i386
skipped #401120
amd64 linux
unit:gcc:stretch:amd64
skipped #401125
amd64 linux
unit:gcc:xenial:amd64
skipped #401132
amd64 linux
unit:nolibtool:sid:amd64
skipped #401129
amd64 linux
unit:pkcs11:sid:amd64
 
  System
skipped #401145
amd64 linux
system:asan:sid:amd64
skipped #401147
amd64 freebsd
system:clang:freebsd11.3:amd64
skipped #401148
amd64 freebsd
system:clang:freebsd12.0:amd64
skipped #401133
amd64 linux
system:gcc:alpine3.10:amd64
skipped #401144
amd64 linux
system:gcc:bionic:amd64
skipped #401139
amd64 linux
system:gcc:buster:amd64
skipped #401134
amd64 linux
system:gcc:centos6:amd64
skipped #401135
amd64 linux
system:gcc:centos7:amd64
skipped #401136
amd64 linux
system:gcc:centos8:amd64
skipped #401142
amd64 linux
system:gcc:fedora30:amd64
skipped #401137
amd64 linux
system:gcc:jessie:amd64
skipped #401140
amd64 linux
system:gcc:sid:amd64
skipped #401141
i386 linux
system:gcc:sid:i386
skipped #401138
amd64 linux
system:gcc:stretch:amd64
skipped #401143
amd64 linux
system:gcc:xenial:amd64
skipped #401149
amd64 linux
system:nolibtool:sid:amd64
skipped #401146
amd64 linux
system:pkcs11:sid:amd64
 
  Docs
passed #401150
amd64 linux
docs:sid:amd64

00:01:20

 
  Postcheck
skipped #401152
amd64 linux
cppcheck:gcc:sid:amd64
canceled #401151
amd64 linux
scan-build:buster:amd64