Improve descriptions of introspection changes
Several of the introspection changes in Python 3.4 are indirect,
where inspect module changes affected pydoc, and those in turn
affected the help builtin. This update adds versionchanged
notes in the key locations, as well as more coverage in the
What's New document (in particular, a note in the porting
section regarding the expanded domain for inspect.getfullargspec).
diff --git a/Doc/library/pydoc.rst b/Doc/library/pydoc.rst
index e100865..3f520e8 100644
--- a/Doc/library/pydoc.rst
+++ b/Doc/library/pydoc.rst
@@ -84,3 +84,8 @@
.. versionchanged:: 3.2
Added the ``-b`` option, deprecated the ``-g`` option.
+
+.. versionchanged:: 3.4
+ :mod:`pydoc` now uses :func:`inspect.signature` rather than
+ :func:`inspect.getfullargspec` to extract signature information from
+ callables.