Add split brain protection documentation for vector collection [AI-23… #799

Job	Run time
get-maintenance-branches	1s
backport-to-specified-branch (5.3) / backport	2s
backport-to-all-branch (5.3) / backport	1s
backport-to-all-branch (5.4) / backport	2s
backport-to-all-branch (5.5) / backport	7s
backport-to-specified-branch (5.4) / backport	4s
backport-to-specified-branch (5.5) / backport	2s
	19s

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