Fix common typos. No automatic tools. Handmade…

Change-Id: I1ab4e23b0539f8d39974787f226e57a21f96e959
Reviewed-on: https://gerrit.libreoffice.org/12164
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>