docs: add correct cipher suit to python grpc example

docs/grpc/python.md

@@ -53,6 +53,11 @@ import rpc_pb2_grpc as lnrpc
 import grpc
 import os
 
+# Due to updated ECDSA generated tls.cert we need to let gprc know that
+# we need to use that cipher suite otherwise there will be a handhsake
+# error when we communicate with the lnd rpc server.
+os.environ["GRPC_SSL_CIPHER_SUITES"] = 'HIGH+ECDSA'
+
 # Lnd cert is at ~/.lnd/tls.cert on Linux and
 # ~/Library/Application Support/Lnd/tls.cert on Mac
 cert = open(os.path.expanduser('~/.lnd/tls.cert'), 'rb').read()