Enable from: filter support in cross-team search

[cwarnermm]

@claude - Let's update the Mattermost Product Documentation to reflect the user's cross-team search product experience from Mattermost server v10.10 onward in mattermost/mattermost#31277.

Starting from the master branch, ensure the docs PR is added to the v10.10-documentation branch. The doc updates for end users center around 2 key user takeaways: the from: search modifier is now available for cross-team searches (where the user specifies which team they want to search), and a note that when searching all teams, users need to add the from: modifier manually as part of their search criteria.

[claude]

Claude finished @cwarnermm's task —— View job • claude/issue-8077-20250618_180044 • Create PR ➔

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Updating cross-team search documentation ✅

I've successfully updated the Mattermost Product Documentation to reflect the new from: filter support in cross-team search from v10.10 onward.

Todo List

• Read repository setup instructions (CLAUDE.md - no repo-specific CLAUDE.md found)
• Find existing search documentation files
• Review current cross-team search documentation
• Update documentation with new from: filter functionality
• Include the two key user takeaways:
  • from: search modifier now available for cross-team searches
  • Users must manually add from: modifier when searching all teams
• Commit changes to current branch
• Provide PR creation link for v10.10-documentation branch

Changes Made

File updated: source/collaborate/search-for-messages.rst

1. Cross-team search section (line 32-34): Added note explaining that from Mattermost v10.10, the from: search modifier is available for cross-team searches, and users must manually add the from: modifier when searching all teams.

2. Search modifiers section (line 137): Updated the from: modifier documentation to specifically mention cross-team search support from v10.10.

Next Steps

Note: The maintainers will need to target this PR to the v10.10-documentation branch as requested in the issue.

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