link to scikit-learn tag on stackoverflow, minor formatting.

doc/faq.rst

@@ -31,7 +31,7 @@ What's the best way to get help on scikit-learn usage?
 **For general machine learning questions**, please use
 `Cross Validated <http://stats.stackexchange.com>`_ with the ``[machine-learning]`` tag.
 
-**For scikit-learn usage questions**, please use `Stack Overflow <http://stackoverflow.com>`_
+**For scikit-learn usage questions**, please use `Stack Overflow <http://stackoverflow.com/questions/tagged/scikit-learn>`_
 with the ``[scikit-learn]`` and ``[python]`` tags. You can alternatively use the `mailing list
 <https://mail.python.org/mailman/listinfo/scikit-learn>`_.
 
@@ -59,8 +59,8 @@ There is also a `scikit-learn Gitter channel
 <https://gitter.im/scikit-learn/scikit-learn>`_ where some users and developers
 might be found. 
 
-Please do not email any authors directly to ask for assistance, report bugs,
-or for any other issue related to scikit-learn.
+**Please do not email any authors directly to ask for assistance, report bugs,
+or for any other issue related to scikit-learn.**
 
 How can I create a bunch object?
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