- remove yet another reference to how commonly Tkinter is (thought to be) used

- fix an internal section reference

Doc/lib/tkinter.tex

@@ -19,7 +19,7 @@ module \module{\_tkinter} provides a threadsafe mechanism which allows
 Python and Tcl to interact.
 
 Tk is not the only GUI for Python; see
-section~\ref{other-gui-modules}, ``Other User Interface Modules and
+section~\ref{other-gui-packages}, ``Other User Interface Modules and
 Packages,'' for more information on other GUI toolkits for Python.
 
 % Other sections I have in mind are
@@ -1805,9 +1805,7 @@ directly on Python data structures, without having to transfer data
 through the Tk/Tcl layer.}
 \end{seealso*}
 
-
-Tk is not the only GUI for Python, but is however the
-most commonly used one.
+Other GUI packages are also available for Python:
 
 \begin{seealso*}
 \seetitle[http://www.wxpython.org]{wxPython}{