Desktop app v6.1.1 and v5.13.5 dot release docs

[amyblais]

@claude Please help update docs for Desktop app v6.1.1 and v5.13.5 dot releases. These are the files that need to be updated:

https://github.com/mattermost/docs/blob/master/source/product-overview/mattermost-desktop-releases.md
https://github.com/mattermost/docs/blob/master/source/product-overview/desktop-app-changelog.md
https://github.com/mattermost/docs/blob/master/source/deployment-guide/desktop/linux-desktop-install.rst
https://github.com/mattermost/docs/blob/master/source/deployment-guide/desktop/desktop-msi-installer-and-group-policy-install.rst

[claude]

Claude finished @amyblais's task in 4m 34s —— View job • claude/issue-8808-20260310-0847 • Create PR ➔

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Updating Desktop App Release Docs

• Read CLAUDE.md for repo guidelines
• Read existing files to understand structure
• Update mattermost-desktop-releases.md with v6.1.1 and v5.13.5
• Update desktop-app-changelog.md with v6.1.1 and v5.13.5
• Update linux-desktop-install.rst with new versions
• Update desktop-msi-installer-and-group-policy-install.rst with new versions
• Commit and push changes

Summary

Updated docs for Desktop app v6.1.1 and v5.13.5 dot releases across 4 files:

mattermost-desktop-releases.md

• Updated v6.1 download link and SBOM link from v6.1.0 → v6.1.1
• Updated v5.13 download link and SBOM link from v5.13.4 → v5.13.5

desktop-app-changelog.md

• Added v6.1.1 entry (released 2026-03-10) to the Release v6.1 section, restructured to list format matching other releases
• Updated Download Binaries link from releases/latest → releases/v6.1.1
• Added v5.13.5 entry (released 2026-03-10) to the Release v5.13 section
• Updated Download Binaries link from v5.13.2 → v5.13.5

linux-desktop-install.rst

• Updated RPM download link, install/update commands: 6.1.0 → 6.1.1
• Updated tarball download link: 6.1.0 → 6.1.1
• Updated Flatpak version example: 6.1.0 → 6.1.1

desktop-msi-installer-and-group-policy-install.rst

• Updated release page reference, source.zip link, zip filename, and folder path: v6.1.0 → v6.1.1
• Updated silent install and APPLICATIONFOLDER command examples: v6.1.0 → v6.1.1
• Note: Historical references to v6.1.0 (upgrade instructions, deployment considerations section) were intentionally kept as v6.1.0 since they describe that specific release's behavior

Note: The changelog entries for v6.1.1 and v5.13.5 include placeholder content ("contains bug fixes"). Please update these with the actual release notes for each version.