Add --rpc.websocket.enabled for starting a Pathfinder node (#1675)

add --rpc.websocket.enabled

Author: saniksin

modules/guides/pages/becoming-a-validator/pathfinder.adoc

@@ -95,7 +95,8 @@ docker run \
   -e RUST_LOG=info \
   -e PATHFINDER_ETHEREUM_API_URL=$ETHEREUM_URL \
   -v $HOME/pathfinder:/usr/share/pathfinder/data \
-  eqlabs/pathfinder
+  eqlabs/pathfinder \
+  --rpc.websocket.enabled
 ----
 
 Once the docker container is up and running, you can check the docker image's logs by running: