Minor formatting fixes
Summary: Minor fixes to prevent the parser to add ":kbd:" between the parts of shortcut, create unwanted list of terms, etc.
Test Plan: none
Reviewers: Krita, Krita: Manual, woltherav
Reviewed By: Krita, Krita: Manual, woltherav
Tags: Krita: Manual
Differential Revision: https://phabricator.kde.org/D19483