Merge pull request puppetlabs#300 from trlinkin/file_line_docs

(MODULES-1221) Add file_line autorequire documentation

Author: hunner

lib/puppet/type/file_line.rb

@@ -21,6 +21,9 @@
     In this example, Puppet will ensure both of the specified lines are
     contained in the file /etc/sudoers.
 
+    **Autorequires:** If Puppet is managing the file that will contain the line
+    being managed, the file_line resource will autorequire that file.
+
   EOT
 
   ensurable do