Fix malformed return value in API docs (#130)

Signed-off-by: Webster Mudge <wmudge@cloudera.com>

Author: wmudge

plugins/modules/datahub_cluster_recipe.py

@@ -106,7 +106,7 @@
       description: Name of the CDP Datahub.
       returned: always
       type: str
-    detached_recipes::
+    detached_recipes:
       description: List of recipes detached from the instance group.
       returned: always
       type: list