access_control.md: fix insecure password example

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• Target branch: main
• Changes should be cherry-picked to 24.1: no
• Staging: https://docs.binary.picodata.io/picodata/fix_pw_example/

added docs: update label

requested review from @rosik

assigned to @a.tolstoy

changed the description

added 3 commits

• 8f284d57...9f2aeb55 - 2 commits from branch main
• 5da3a5be - access_control.md: fix insecure password example

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enabled an automatic merge when the pipeline for 5da3a5be succeeds

merged