remove some trailing whitespace

docs/plugins/fetchart.rst

@@ -51,9 +51,9 @@ file. The available options are:
   to all available sources.
   Default: ``filesystem coverart itunes amazon albumart``, i.e., everything but
   ``wikipedia``, ``google`` and ``fanarttv``. Enable those sources for more
-  matches at the cost of some speed. They are searched in the given order, 
+  matches at the cost of some speed. They are searched in the given order,
   thus in the default config, no remote (Web) art source are queried if
-  local art is found in the filesystem. To use a local image as fallback, 
+  local art is found in the filesystem. To use a local image as fallback,
   move it to the end of the list.
 - **google_key**: Your Google API key (to enable the Google Custom Search
   backend).

docs/plugins/lastgenre.rst

@@ -53,7 +53,7 @@ a desired subset of genres. Consider for a example this minimal whitelist::
     rock
     heavy metal
     pop
-    
+
 together with the default genre tree. Then an item that has its genre specified
 as *viking metal* would actually be tagged as *heavy metal* because neither
 *viking metal* nor its parent *black metal* are in the whitelist. It always

docs/plugins/lyrics.rst

@@ -133,9 +133,9 @@ using `pip`_ by typing::
     pip install langdetect
 
 You also need to register for a Microsoft Azure Marketplace free account and
-to the `Microsoft Translator API`_. Follow the four steps process, specifically 
-at step 3 enter ``beets`` as *Client ID* and copy/paste the generated 
-*Client secret* into your ``bing_client_secret`` configuration, alongside 
+to the `Microsoft Translator API`_. Follow the four steps process, specifically
+at step 3 enter ``beets`` as *Client ID* and copy/paste the generated
+*Client secret* into your ``bing_client_secret`` configuration, alongside
 ``bing_lang_to`` target `language code`_.
 
 .. _langdetect: https://pypi.python.org/pypi/langdetect