Reuse upstream wording and remove mention of Microsoft
List all the LibreOffice tools
Use canonical menu path markup

Note that Math does not have its own menu entry and is only available from the
LibreOffice starter menu. That's why we're pointing to it.
Point to upstream documentation
Merge branch 'testing' into devel
Merge remote-tracking branch 'origin/devel' into devel
Merge remote-tracking branch 'origin/doc/office' into testing