Reverting some ResourceRef changes (#226)

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

plugins/modules/gcp_compute_backend_service.py

@@ -98,10 +98,10 @@ options:
         - When the BackendService has load balancing scheme INTERNAL, the instance
           group must be in a zone within the same region as the BackendService.
         - 'This field represents a link to a InstanceGroup 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_instance_group task and then set this group field to "{{
-          name-of-resource }}"'
+          be specified 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_instance_group task and then set this
+          group field to "{{ name-of-resource }}"'
         required: false
       max_connections:
         description:
@@ -401,7 +401,7 @@ backends:
       - When the BackendService has load balancing scheme INTERNAL, the instance group
         must be in a zone within the same region as the BackendService.
       returned: success
-      type: str
+      type: dict
     maxConnections:
       description:
       - The max number of simultaneous connections for the group. Can be used with
@@ -658,7 +658,7 @@ def main():
                     balancing_mode=dict(default='UTILIZATION', type='str', choices=['UTILIZATION', 'RATE', 'CONNECTION']),
                     capacity_scaler=dict(default=1.0, type='str'),
                     description=dict(type='str'),
-                    group=dict(),
+                    group=dict(type='dict'),
                     max_connections=dict(type='int'),
                     max_connections_per_instance=dict(type='int'),
                     max_rate=dict(type='int'),