mpd: Fix review comments for commands blacklist

docs/changelog.rst

@@ -85,7 +85,7 @@ v0.20.0 (UNRELEASED)
   :issue:`934`, PR: :issue:`968`)
 
 - Add support for blacklisting MPD commands. This is used to prevent clients
-  from using `listall` and `listallinfo` which recursively lookup the entire
+  from using ``listall`` and ``listallinfo`` which recursively lookup the entire
   "database". If you insist on using a client that needs these commands change
   :confval:`mpd/command_blacklist`.
 

docs/ext/mpd.rst

@@ -103,6 +103,6 @@ See :ref:`config` for general help on configuring Mopidy.
 .. confval:: mpd/command_blacklist
 
     List of MPD commands which are disabled by the server. By default this
-    setting blacklists `listall` and `listallinfo`. These commands don't fit
-    well with many of Mopidy's backends and are better left disabled unless
+    setting blacklists ``listall`` and ``listallinfo``. These commands don't
+    fit well with many of Mopidy's backends and are better left disabled unless
     you know what you are doing.

mopidy/mpd/exceptions.py

@@ -90,6 +90,7 @@ class MpdNotImplemented(MpdAckError):
 
 
 class MpdDisabled(MpdAckError):
+    # NOTE: this is a custom error for mopidy that does not exists in MPD.
     error_code = 0
 
     def __init__(self, *args, **kwargs):

mopidy/utils/deprecation.py

@@ -5,7 +5,6 @@ import warnings
 
 
 def _is_pykka_proxy_creation():
-    return False
     stack = inspect.stack()
     try:
         calling_frame = stack[3]