client side validation can't have docs with explicit choices (#258)

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

plugins/modules/gcp_compute_global_forwarding_rule.py

@@ -83,22 +83,14 @@ options:
     - The IP protocol to which this rule applies. Valid options are TCP, UDP, ESP,
       AH, SCTP or ICMP. When the load balancing scheme is INTERNAL_SELF_MANAGED, only
       TCP is valid.
+    - 'Some valid choices include: "TCP", "UDP", "ESP", "AH", "SCTP", "ICMP"'
     required: false
-    choices:
-    - TCP
-    - UDP
-    - ESP
-    - AH
-    - SCTP
-    - ICMP
   ip_version:
     description:
     - The IP Version that will be used by this global forwarding rule.
     - Valid options are IPV4 or IPV6.
+    - 'Some valid choices include: "IPV4", "IPV6"'
     required: false
-    choices:
-    - IPV4
-    - IPV6
   load_balancing_scheme:
     description:
     - This signifies what the GlobalForwardingRule will be used for.
@@ -106,10 +98,8 @@ options:
       Global HTTP(S) LB. The value of EXTERNAL means that this will be used for External
       Global Load Balancing (HTTP(S) LB, External TCP/UDP LB, SSL Proxy) NOTE: Currently
       global forwarding rules cannot be used for INTERNAL load balancing.'
+    - 'Some valid choices include: "INTERNAL_SELF_MANAGED", "EXTERNAL"'
     required: false
-    choices:
-    - INTERNAL_SELF_MANAGED
-    - EXTERNAL
   name:
     description:
     - Name of the resource; provided by the client when the resource is created. The