fix ihate docs example (fix #393)

Author: sampsyo

docs/plugins/ihate.rst

@@ -12,17 +12,17 @@ your beets config. Then, add an ``ihate:`` section to your configuration file::
 
     ihate:
         # you will be warned about these suspicious genres/artists (regexps):
-        warn_genre=rnb soul power\smetal
-        warn_artist=bad\band another\sbad\sband
-        warn_album=tribute\sto
+        warn_genre: rnb soul power\smetal
+        warn_artist: bad\band another\sbad\sband
+        warn_album: tribute\sto
         # if you don't like a genre in general, but accept some band playing it,
         # add exceptions here:
-        warn_whitelist=hate\sexception
+        warn_whitelist: hate\sexception
         # never import any of this:
-        skip_genre=russian\srock polka
-        skip_artist=manowar
-        skip_album=christmas
+        skip_genre: russian\srock polka
+        skip_artist: manowar
+        skip_album: christmas
         # but import this:
-        skip_whitelist=
+        skip_whitelist: ''
 
 Note: The plugin will trust your decision in 'as-is' mode.