More richtext fixes for Phoenix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74128 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove some wxT()'s in the docs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74129 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
More docs cleanup and fixes for richtextbuffer

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74130 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775