`PDFViewer` on Phoenix: slight reformatting of the docstrings (something more should be done...)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73745 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Phoenix documentation: make the footer show by changing few CSS properties. Also change the copyright to the "wxPython Team".

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73746 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775