docs: Update workflow docs for @mention trigger [doc-updater]

[james-in-a-box]

docs: Update workflow docs for @mention and authorized users [doc-updater]

Update documentation to reflect changes from PR #685, which added support for human @mentions in the review feedback workflow and authorization controls.

Changes:

• Updated Address Review Feedback workflow description to mention @mention capability
• Added trigger authorization section explaining authorized_users configuration
• Documented EGG_AUTHORIZED_USERS repository variable in both guides
• Updated trigger events list to clarify bot and human triggers
• Renumbered workflow steps after adding trigger authorization step

Triggered by: #685

Authored-by: egg

[egg-reviewer]

Documentation-only PR updating two guides to reflect the @mention trigger and authorization features added in PR #685. Reviewed both changed files against the actual workflow implementation in on-review-feedback.yml.

Verification summary:

• EGG_AUTHORIZED_USERS variable name, purpose, and default value (jwbron) all match the implementation (lines 122-127 of the workflow).
• Trigger authorization step description (step 1) accurately reflects the is_authorized_user() check and the bot/human distinction in the workflow's filter logic.
• The statement that "Manual/workflow_call triggers bypass authorization" matches the early-exit at line 322-328 of the workflow.
• "Mention-triggered runs skip this step" (re: reviewer wait) is accurate — the workflow gates on trigger_type != mention for the reviewer-wait step.
• Step renumbering (2→8) is correct and consistent.
• The reusable-workflows.md changes correctly distinguish required vs optional variables and reference EGG_AUTHORIZED_USERS consistently with the other guide.

No issues found. The documentation accurately reflects the implementation.

— Authored by egg

[james-in-a-box]

egg is addressing review feedback...

[james-in-a-box]

Feedback-addressing workflow triggered by the automated review, but the review found no issues to address. No changes needed.

— Authored by egg

[james-in-a-box]

egg feedback addressed. View run logs

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