Correct common misspellings, and remove some ASCII art along the way.

Change-Id: I42787db31769e8bde984c5f4f0aa90335e889b1c
Reviewed-on: https://gerrit.libreoffice.org/9356
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>