[plan] Update documentation for expires field usage

[github-actions]

Objective

Review and update documentation to ensure expires field usage is accurately documented without hour support.

Context

After removing hour support from the schema, we need to ensure user-facing documentation reflects the correct supported time units (days, weeks, months, years).

Approach

1. Search documentation for expires field examples
2. Look for references to hours in time specifications
3. Update examples to use only supported units (d, w, m, y)
4. Check locations:
   • docs/ directory (if exists)
   • README.md
   • Example workflow files in .github/workflows/*.md
   • Any tutorial or guide files

Files to Check

• docs/**/*.md
• README.md
• .github/workflows/*.md (example workflows)
• Any API reference documentation

Acceptance Criteria

• All expires field examples use valid time units only
• No documentation references hour support for expires
• Documentation clearly states supported units: days (d), weeks (w), months (m), years (y)
• Examples are consistent with the updated schema
  Related to [plan] Fix expires field schema-implementation mismatch #7198

AI generated by Plan Command for discussion #7174