GRPC-WEB is a valid port protocol, but not listed (#2986)

* GRPC-WEB is a valid port protocol, but not listed
correctly in the docs.

Adopted from istio/istio.io#10942.

* Add generated files

Author: craigbox

networking/v1alpha3/gateway.pb.go

@@ -597,7 +597,7 @@ message Port {
   uint32 number = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The protocol exposed on the port.
-  // MUST BE one of HTTP|HTTPS|GRPC|HTTP2|MONGO|TCP|TLS.
+  // MUST BE one of HTTP|HTTPS|GRPC|GRPC-WEB|HTTP2|MONGO|TCP|TLS.
   // TLS can be either used to terminate non-HTTP based connections on a specific port
   // or to route traffic based on SNI header to the destination without terminating the TLS connection.
   string protocol = 2 [(google.api.field_behavior) = REQUIRED];

networking/v1alpha3/gateway.pb.html

@@ -597,7 +597,7 @@ message Port {
   uint32 number = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The protocol exposed on the port.
-  // MUST BE one of HTTP|HTTPS|GRPC|HTTP2|MONGO|TCP|TLS.
+  // MUST BE one of HTTP|HTTPS|GRPC|GRPC-WEB|HTTP2|MONGO|TCP|TLS.
   // TLS can be either used to terminate non-HTTP based connections on a specific port
   // or to route traffic based on SNI header to the destination without terminating the TLS connection.
   string protocol = 2 [(google.api.field_behavior) = REQUIRED];