fix problematic link (#27673)

Signed-off-by: cui fliter <imcusg@gmail.com>

Mirrored from https://github.com/envoyproxy/envoy @ 58ec492086e290c2a94b818206c86bce8201f3c0

envoy/extensions/transport_sockets/s2a/v3/s2a.proto

@@ -14,7 +14,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // [#not-implemented-hide:]
 // Configuration for S2A transport socket. This allows Envoy clients to
 // configure how to offload mTLS handshakes to the S2A service.
-// https://github.com/google/s2a-core#readme
+// https://github.com/google/s2a-go#readme
 message S2AConfiguration {
   // The address of the S2A. This can be an IP address or a hostname,
   // followed by a port number.