Use "wxWindows licence" and not "wxWidgets licence" and also use British spelling for licence. Updated new occurrences in recently added files and a couple of previously (r64940) missed ones.
See #12165.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67387 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775