add metadata to doc support (#18802)

fix broken module docs
change doc AST id extraction to use == instead of in

lib/ansible/modules/clustering/znode.py

@@ -25,7 +25,8 @@ DOCUMENTATION = """
 module: znode
 version_added: "2.0"
 short_description: Create, delete, retrieve, and update znodes using ZooKeeper
-description: Create, delete, retrieve, and update znodes using ZooKeeper.
+description:
+    - Create, delete, retrieve, and update znodes using ZooKeeper.
 options:
     hosts:
         description:

lib/ansible/modules/windows/win_reboot.py

@@ -73,7 +73,7 @@ EXAMPLES='''
     reboot_timeout_sec: 3600
 '''
 
-RETURNS='''
+RETURN='''
 rebooted:
     description: true if the machine was rebooted
     returned: always