Update Cloud Run Resource to make containerPort be optional (GoogleCl…

…oudPlatform#5677)

* change to optional per docs

* fix formatting issues

mmv1/products/cloudrun/api.yaml

@@ -562,14 +562,13 @@ objects:
                 properties:
                 - !ruby/object:Api::Type::String
                   name: name
-                  description: Name of the port.
+                  description: If specified, used to specify which protocol to use. Allowed values are "http1" and "h2c".
                 - !ruby/object:Api::Type::String
                   name: protocol
-                  description: Protocol used on port. Defaults to TCP.
+                  description: Protocol for port. Must be "TCP". Defaults to "TCP".
                 - !ruby/object:Api::Type::Integer
                   name: containerPort
-                  description: Port number.
-                  required: true
+                  description: Port number the container listens on. This must be a valid port number, 0 < x < 65536.
             - !ruby/object:Api::Type::NestedObject
               name: resources
               description: |-