Change some mercurial/ hg.python.org references. (#8)

Doc/faq/general.rst

@@ -159,7 +159,7 @@ How do I obtain a copy of the Python source?
 
 The latest Python source distribution is always available from python.org, at
 https://www.python.org/downloads/.  The latest development sources can be obtained
-via anonymous Mercurial access at https://hg.python.org/cpython.
+at https://github.com/python/cpython/.
 
 The source distribution is a gzipped tar file containing the complete C source,
 Sphinx-formatted documentation, Python library modules, example programs, and
@@ -222,8 +222,8 @@ releases are announced on the comp.lang.python and comp.lang.python.announce
 newsgroups and on the Python home page at https://www.python.org/; an RSS feed of
 news is available.
 
-You can also access the development version of Python through Mercurial.  See
-https://docs.python.org/devguide/faq.html for details.
+You can also access the development version of Python through Git.  See
+`The Python Developer's Guide <https://docs.python.org/devguide/>`_ for details.
 
 
 How do I submit bug reports and patches for Python?

Lib/idlelib/help.html

@@ -90,7 +90,7 @@
 
   <div class="section" id="idle">
 <span id="id1"></span><h1>25.5. IDLE<a class="headerlink" href="#idle" title="Permalink to this headline">¶</a></h1>
-<p><strong>Source code:</strong> <a class="reference external" href="https://hg.python.org/cpython/file/3.5/Lib/idlelib/">Lib/idlelib/</a></p>
+<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.5/Lib/idlelib">Lib/idlelib/</a></p>
 <hr class="docutils" id="index-0" />
 <p>IDLE is Python&#8217;s Integrated Development and Learning Environment.</p>
 <p>IDLE has the following features:</p>

Tools/README

@@ -43,4 +43,4 @@ unittestgui     A Tkinter based GUI test runner for unittest, with test
                 discovery.
 
 
-(*) A generic benchmark suite is maintained separately at http://hg.python.org/benchmarks/
+(*) A generic benchmark suite is maintained separately at https://github.com/python/performance

Tools/importbench/README

@@ -3,4 +3,4 @@ Importbench is a set of micro-benchmarks for various import scenarios.
 It should not be used as an overall benchmark of import performance, but rather
 an easy way to measure impact of possible code changes. For a real-world
 benchmark of import, use the normal_startup benchmark from
-hg.python.org/benchmarks.
+https://github.com/python/performance