tagging.py now retains the art ratio when resizing

Author: dconrad5

docs/extensions/tagging.md

@@ -23,7 +23,7 @@ artwork will be preferred if it is present - if not, the channel artwork will be
 Note that episode-specific artwork in MP4 files is currently not implemented.
 
 The artwork can optionally be normalized to the desired parameters - size and file type.
-By default, it will write 500px x 500px baseline JPEGs.
+By default, it will write 500px baseline JPEGs.
 
 This extension can optionally remove all tags instead of doing any of the above.
 This is disabled by default.