fix typo in size 2530 --> 3530

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76273 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Document wxRibbonDisplayMode enum.

See #16133.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76274 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775