Reverting some ResourceRef changes (#226)

Signed-off-by: Modular Magician <magic-modules@google.com>

plugins/modules/gcp_compute_address.py

@@ -101,9 +101,10 @@ options:
     - This field can only be used with INTERNAL type with GCE_ENDPOINT/DNS_RESOLVER
       purposes.
     - 'This field represents a link to a Subnetwork resource in GCP. It can be specified
-      in two ways. First, you can place in the selfLink of the resource here as a
-      string Alternatively, you can add `register: name-of-resource` to a gcp_compute_subnetwork
-      task and then set this subnetwork field to "{{ name-of-resource }}"'
+      in two ways. First, you can place a dictionary with key ''selfLink'' and value
+      of your resource''s selfLink Alternatively, you can add `register: name-of-resource`
+      to a gcp_compute_subnetwork task and then set this subnetwork field to "{{ name-of-resource
+      }}"'
     required: false
     version_added: 2.7
   region:
@@ -181,7 +182,7 @@ subnetwork:
   - This field can only be used with INTERNAL type with GCE_ENDPOINT/DNS_RESOLVER
     purposes.
   returned: success
-  type: str
+  type: dict
 users:
   description:
   - The URLs of the resources that are using this address.
@@ -219,7 +220,7 @@ def main():
             description=dict(type='str'),
             name=dict(required=True, type='str'),
             network_tier=dict(type='str', choices=['PREMIUM', 'STANDARD']),
-            subnetwork=dict(),
+            subnetwork=dict(type='dict'),
             region=dict(required=True, type='str'),
         )
     )