Add warning to raw and script modules that there is no actual free_form parameter (like for command etc).

lib/ansible/modules/commands/raw.py

@@ -27,7 +27,7 @@ version_added: historical
 options:
   free_form:
     description:
-      - the raw module takes a free form command to run
+      - the raw module takes a free form command to run. There is no parameter actually named 'free form'; see the examples!
     required: true
   executable:
     description:

lib/ansible/modules/commands/script.py

@@ -32,7 +32,7 @@ description:
 options:
   free_form:
     description:
-      - path to the local script file followed by optional arguments.
+      - path to the local script file followed by optional arguments. There is no parameter actually named 'free form'; see the examples!
     required: true
     default: null
     aliases: []