[Patch #1005465] Markup tweaks

Doc/lib/libfuncs.tex

@@ -126,7 +126,7 @@ class C:
   Class methods are different than \Cpp{} or Java static methods.
   If you want those, see \function{staticmethod()} in this section.
   \versionadded{2.2}
-  Function decorator syntax added in version 2.4.
+  \versionchanged[Function decorator syntax added]{2.4}
 \end{funcdesc}
 
 \begin{funcdesc}{cmp}{x, y}
@@ -958,6 +958,7 @@ class C:
   For a more advanced concept, see \function{classmethod()} in this
   section.
   \versionadded{2.2}
+  \versionchanged[Function decorator syntax added]{2.4}
 \end{funcdesc}
 
 \begin{funcdesc}{str}{\optional{object}}