Hints for libreoffice-plasma in main

Hints

• asv-url-not-secure
  :16 - http://www.libreoffice.org/discover/writer/
  Consider using a secure (HTTPS) URL for this web link.
• asv-url-not-secure
  :20 - http://www.libreoffice.org/get-help/documentation/
  Consider using a secure (HTTPS) URL for this web link.