Changing variable to generic names

Author: rishigupta1599

lib/core/Proxy.js

@@ -103,9 +103,9 @@ class Proxy {
           customReqInstance.addCustomRequest(commandId);
 
           //Send to playwright server
-          const railsId = [...this.contexts.keys()][0];
-          const railsContext = this.contexts.get(railsId);
-          railsContext.outgoingSocket.send(JSON.stringify(command));
+          const sessionId = [...this.contexts.keys()][0];
+          const sessionContext = this.contexts.get(sessionId);
+          sessionContext.outgoingSocket.send(JSON.stringify(command));
 
           //Get the resolved promise and returning it to end user
           customReqInstance.customRequestList[commandId].promise