Standardized capitalization of "GitHub" in docs

docs/_templates/sidebarintro.html

@@ -17,6 +17,6 @@
 <ul>
   <li><a href="http://flask.pocoo.org/">The Flask Website</a></li>
   <li><a href="http://pypi.python.org/pypi/Flask">Flask @ PyPI</a></li>
-  <li><a href="http://github.com/mitsuhiko/flask">Flask @ github</a></li>
+  <li><a href="http://github.com/mitsuhiko/flask">Flask @ GitHub</a></li>
   <li><a href="http://github.com/mitsuhiko/flask/issues">Issue Tracker</a></li>
 </ul>

docs/extensions.rst

@@ -32,7 +32,7 @@ depending on how the extension is distributed.  If you want to develop an
 application that supports Flask 0.7 or earlier you should still import
 from the :data:`flask.ext` package.  We provide you with a compatibility
 module that provides this package for older versions of Flask.  You can
-download it from github: `flaskext_compat.py`_
+download it from GitHub: `flaskext_compat.py`_
 
 And here is how you can use it::
 

docs/patterns/jquery.rst

@@ -165,4 +165,4 @@ explanation of the little bit of code above:
 If you don't get the whole picture, download the `sourcecode
 for this example
 <https://github.com/mitsuhiko/flask/tree/master/examples/jqueryexample>`_
-from github.
+from GitHub.