Merge branch 'each-sync-v9_12' into 'v9_12'

synchronize 9.12.4-P1 documentation into v9_12

See merge request !1914
2 jobs for v9_12 in 1 minute and 1 second (queued for 1 second)
Status Job ID Name Coverage
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passed #227542
amd64 linux
docs:sid:amd64

00:00:47

 
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amd64 linux
push:docs:sid:amd64

00:00:13