Slight docs tweak and remove redundant sys.exit call

cloud/s3

@@ -57,7 +57,7 @@ options:
     version_added: "1.2"
   mode:
     description:
-      - Switches the module behaviour between put (upload), get (download), geturl (return download url), getstr (download object as string) create (bucket) and delete (bucket). 
+      - Switches the module behaviour between put (upload), get (download), geturl (return download url (Ansible 1.3+), getstr (download object as string (1.3+)), create (bucket) and delete (bucket). 
     required: true
     default: null
     aliases: []
@@ -154,7 +154,6 @@ def delete_key(module, s3, bucket, obj):
         bucket = s3.lookup(bucket)
         bucket.delete_key(obj)
         module.exit_json(msg="Object deleted from bucket %s"%bucket, changed=True)
-        sys.exit(0)
     except s3.provider.storage_response_error, e:
         module.fail_json(msg= str(e))