+ Added example for add/remove characters for similarity
+ Suppressed hidden <ahelp> (already moved to dialog)
+ Link to wikipedia
+ reorder paragraphs
Change-Id: Idb041e31a2041a4603766a75da22459fa74d75b8
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/171841
Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>