en: Add a doc about how to run as non root user #7409

Job	Run time
check-git-conflicts	11s
check-control-characters	9s
check-file-encoding	7s
check-manual-line-breaks	7s
markdownlint	21s
check-unclosed-tags	8s
verify-internal-link-anchors	15s
verify-internal-links	10s
	1m 28s

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