Fix variable name mis-match in website docs for ANSIBLE_LIBRARY. Clean up some dangling whitespace

docsite/rst/developing_modules.rst

@@ -425,7 +425,8 @@ built and appear in the 'docsite/' directory.
 Module Paths
 ````````````
 
-If you are having trouble getting your module "found" by ansible, be sure it is in the ANSIBLE_LIBRARY_PATH.
+If you are having trouble getting your module "found" by ansible, be
+sure it is in the ``ANSIBLE_LIBRARY`` environment variable.
 
 If you have a fork of one of the ansible module projects, do something like this::
 
@@ -584,5 +585,3 @@ This example allows the stat module to be called with fileinfo, making the follo
        Development mailing list
    `irc.freenode.net <http://irc.freenode.net>`_
        #ansible IRC chat channel
-
-