docs: clean up trailing whitespace

Author: dhellmann

docs/source/plugins.rst

@@ -80,7 +80,7 @@ techniques.
 
 The API is the same for every extension point.  Each uses a Python
 function that takes a single argument, a list of strings passed to the
-hook loader on the command line.  
+hook loader on the command line.
 
 ::
 
@@ -106,7 +106,7 @@ user scripts when ``virtualenvwrapper.sh`` is loaded.
     def initialize(args):
         for filename, comment in GLOBAL_HOOKS:
             make_hook(os.path.join('$WORKON_HOME', filename), comment)
-        return 
+        return
 
 .. _plugins-user-env:
 
@@ -156,7 +156,7 @@ shell process.
     where examining the ``SHELL`` environment variable to generate
     different syntax for each case is the only way to achieve the
     desired result.
-    
+
 Registering Entry Points
 ------------------------
 
@@ -200,9 +200,9 @@ application, use the ``-m`` option to the interpreter::
 
   $ python -m virtualenvwrapper.hook_loader -h
   Usage: virtualenvwrapper.hook_loader [options] <hook> [<arguments>]
-  
+
   Manage hooks for virtualenvwrapper
-  
+
   Options:
     -h, --help            show this help message and exit
     -s, --source          Print the shell commands to be run in the current
@@ -213,7 +213,7 @@ application, use the ``-m`` option to the interpreter::
     -q, --quiet           Show less information on the console
     -n NAMES, --name=NAMES
                           Only run the hook from the named plugin
-  
+
 To run the extensions for the initialize hook::
 
   $ python -m virtualenvwrapper.hook_loader -v initialize
@@ -375,7 +375,7 @@ Plugins that define new operations can also define new extension
 points.  No setup needs to be done to allow the hook loader to find
 the extensions; documenting the names and adding calls to
 ``virtualenvwrapper_run_hook`` is sufficient to cause them to be
-invoked.  
+invoked.
 
 The hook loader assumes all extension point names start with
 ``virtualenvwrapper.`` and new plugins will want to use their own