Fix querying the value of wxEnumProperty in wxPropertyGridEditor.

Doing this changed the internal state of the control and resulted in the
choice not being updated.

Fix this by using wxPG_PROPERTY_SPECIFIC.

Closes #15449.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76551 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix recursive self-reference in wxRichTextAttr documentation.

Refer to wxTextAttr, not wxRichTextAttr itself.

Closes #16271.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76552 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775