Update ruby.md

docs/grpc/ruby.md

@@ -58,7 +58,7 @@ $:.unshift(File.dirname(__FILE__))
 require 'grpc'
 require 'lightning_services_pb'
 
-# Due to updated ECDSA generated tls.cert we need to let gprc know that
+# Due to updated ECDSA generated tls.cert we need to let grpc know that
 # we need to use that cipher suite otherwise there will be a handshake
 # error when we communicate with the lnd rpc server.
 ENV['GRPC_SSL_CIPHER_SUITES'] = "HIGH+ECDSA"