Add a doc about maintaining a node #7945

Job	Run time
check-git-conflicts	12s
check-file-encoding	8s
check-manual-line-breaks	9s
verify-internal-link-anchors	17s
check-control-characters	12s
verify-internal-links	31s
markdownlint	28s
check-unclosed-tags	12s
	2m 9s

Provide feedback