Update fetch documentation

fetch

@@ -7,9 +7,9 @@ short_description: Fetches a file from remote nodes
 description:
      - This module works like M(copy), but in reverse. It is used for fetching
        files from remote machines and storing them locally in a file tree,
-       organized by hostname. Note that this module was originally written to
+       organized by hostname. Note that this module is written to transfer 
-       transfer log files that were not necessarily present, therefore, by
+       log files that might not be present, so a missing remote file won't
-       default, if the source file is missing, it does not fail ; 
+       be an error unless fail_on_missing is set to 'yes'.
 version_added: "0.2"
 options:
   src:
@@ -28,8 +28,9 @@ options:
     required: true
     default: null
   fail_on_missing:
+    version_added: 1.1
     description:
-      - Makes it fails when the source file is missing.
+      - Makes it fails when the source file is missing.  (Option is new in 1.1)
     required: false
     choices: [ "yes", "no" ]
     default: "no"