review: Fix typos found in PR#915 feedback

mopidy/audio/listener.py

@@ -78,13 +78,13 @@ class AudioListener(listener.Listener):
 
     def tags_changed(self, tags):
         """
-        Called whenever the current audio streams tags changes.
+        Called whenever the current audio stream's tags change.
 
         This event signals that some track metadata has been updated. This can
         be metadata such as artists, titles, organization, or details about the
         actual audio such as bit-rates, numbers of channels etc.
 
-        For the available tag keys please refer to GStreamer documenation for
+        For the available tag keys please refer to GStreamer documentation for
         tags.
 
         *MAY* be implemented by actor.

mopidy/audio/utils.py

@@ -128,7 +128,7 @@ def convert_tags_to_track(tags):
 
 
 def convert_taglist(taglist):
-    """Convert a :class:`gst.Taglist` to plain python types.
+    """Convert a :class:`gst.Taglist` to plain Python types.
 
     Knows how to convert:
      - Dates