LBAAS: add tls_cipher_policy to api docs (#1004)

Author: jvasilevsky

specification/resources/load_balancers/models/load_balancer_base.yml

@@ -35,7 +35,7 @@ properties:
     readOnly: true
     example: '2604:a880:800:14::85f5:c000'
     description: An attribute containing the public-facing IPv6 address of the
-      load balancer. Note that this feature is currently in private preview.
+      load balancer.
 
   size_unit:
     type: integer
@@ -185,7 +185,7 @@ properties:
     default: IPV4
     description: A string indicating whether the load balancer will support IPv4 
       or both IPv4 and IPv6 networking. This property cannot be updated after
-      creating the load balancer. Note that this feature is in private preview.
+      creating the load balancer.
 
   type:
     type: string
@@ -219,5 +219,16 @@ properties:
     description: An array containing the UUIDs of the Regional load balancers to be used as target
       backends for a Global load balancer.
 
+  tls_cipher_policy:
+    type: string
+    example: STRONG
+    enum:
+      - DEFAULT
+      - WEAK
+      - STRONG
+    default: DEFAULT
+    description: A string indicating the policy for the TLS cipher suites used by the load balancer.
+      The possible values are `DEFAULT`, `WEAK`, or `STRONG`. The default value is `DEFAULT`.
+
 required:
   - forwarding_rules