docs: Use dashes in all labels

docs/changes.rst

@@ -592,7 +592,7 @@ to this problem.
 - Local backend:
 
   - Add :command:`mopidy-scan` command to generate ``tag_cache`` files without
-    any help from the original MPD server. See :ref:`generating_a_tag_cache`
+    any help from the original MPD server. See :ref:`generating-a-tag-cache`
     for instructions on how to use it.
 
   - Fix support for UTF-8 encoding in tag caches.
@@ -601,7 +601,7 @@ to this problem.
 
   - Add support for password authentication. See
     :attr:`mopidy.settings.MPD_SERVER_PASSWORD` and
-    :ref:`use_mpd_on_a_network` for details on how to use it. (Fixes:
+    :ref:`use-mpd-on-a-network` for details on how to use it. (Fixes:
     :issue:`41`)
 
   - Support ``setvol 50`` without quotes around the argument. Fixes volume

docs/settings.rst

@@ -63,7 +63,7 @@ You may also want to change some of the ``LOCAL_*`` settings. See
     have support for this in a future release.
 
 
-.. _generating_a_tag_cache:
+.. _generating-a-tag-cache:
 
 Generating a tag cache
 ----------------------
@@ -94,7 +94,7 @@ To make a ``tag_cache`` of your local music available for Mopidy:
 #. Start Mopidy, find the music library in a client, and play some local music!
 
 
-.. _use_mpd_on_a_network:
+.. _use-mpd-on-a-network:
 
 Connecting from other machines on the network
 =============================================
@@ -123,7 +123,7 @@ file::
     LASTFM_PASSWORD = u'mysecret'
 
 
-.. _install_desktop_file:
+.. _install-desktop-file:
 
 Controlling Mopidy through the Ubuntu Sound Menu
 ================================================

mopidy/frontends/mpris/__init__.py

@@ -16,7 +16,7 @@ An example of an MPRIS client is the `Ubuntu Sound Menu
   Ubuntu/Debian.
 
 - An ``.desktop`` file for Mopidy installed at the path set in
-  :attr:`mopidy.settings.DESKTOP_FILE`. See :ref:`install_desktop_file` for
+  :attr:`mopidy.settings.DESKTOP_FILE`. See :ref:`install-desktop-file` for
   details.
 
 **Settings:**