Fix sphinx warnsing in docs.

Add -W to sphinx options to avoid warnings in the future.

docs/Makefile

@@ -2,7 +2,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -W
 SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = build

docs/source/plugindocs/raven.rst

@@ -1,2 +1 @@
-.. _raven-setup: Set up the raven plugin
 .. include:: ../../../mediagoblin/plugins/raven/README.rst

docs/source/siteadmin/relnotes.rst

@@ -28,8 +28,8 @@ carefully, or at least skim over it.
 2. OpenStreetMap is now a plugin, so if you want to use it, add the
    following to your config file::
 
-  [plugins]
-  [[mediagoblin.plugins.geolocation]]
+    [plugins]
+    [[mediagoblin.plugins.geolocation]]
 
 If you have your own theme, you may need to make some adjustments to
 it as some theme related things may have changed in this release.  If