docs: public NettyChannelBuilder sslContext(SslContext sslContext) {
      if (sslContext != null) {
        checkArgument(sslContext.isClient(),
            "Server SSL context can not be used for client channel");
        GrpcSslContexts.ensureAlpnAndH2Enabled(sslContext.applicationProtocolNegotiator());
      }
      this.sslContext = sslContext;
      return this;
    }