Minor punctuation fixes and anonymous references
Summary: Punctuation and a fix for "KritaFAQ.rst:27: WARNING: Duplicate explicit target name: "this page"."
Test Plan: none
Reviewers: Krita, Krita: Manual, woltherav
Reviewed By: Krita, Krita: Manual, woltherav
Subscribers: woltherav
Tags: Krita: Manual
Differential Revision: https://phabricator.kde.org/D19700