[gnome-music] grltrackerwrapper: Add a docstring to get_artist_art function

[Jean Felder <jfelder src gnome org>]

commit fad2da67c1b3496fd262aae377eb04fe257b063b
Author: Chinmay Gurjar <chnmgurjar gmail com>
Date:   Fri Jul 3 18:44:02 2020 +0530

    grltrackerwrapper: Add a docstring to  get_artist_art function

 gnomemusic/grilowrappers/grltrackerwrapper.py | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gnomemusic/grilowrappers/grltrackerwrapper.py b/gnomemusic/grilowrappers/grltrackerwrapper.py
index d1e5db39..db192e2f 100644
--- a/gnomemusic/grilowrappers/grltrackerwrapper.py
+++ b/gnomemusic/grilowrappers/grltrackerwrapper.py
@@ -985,6 +985,10 @@ class GrlTrackerWrapper(GObject.GObject):
         return query
 
     def get_artist_art(self, coreartist):
+        """Get artist art for the artist
+
+        :param CoreArtist coreartist: coreartist
+        """
         media = coreartist.props.media
 
         def _resolve_cb(source, op_id, resolved_media, data, error):