Phoenix docs: fix `floatcanvas/FloatCanvas.py` docstrings to avoid Sphinx warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75853 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Phoenix docs: fix `imagebrowser.py` docstrings to avoid Sphinx warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75854 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Phoenix docs: fix `masked\textctrl.py` docstrings to avoid Sphinx warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75855 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775