Better error message format

Summary:
The existing error message was not in the centre and didn't give any possible remediation steps.

{F1015240268}

Reviewed By: passy

Differential Revision: D46394149

fbshipit-source-id: 09d450bef9df83c5b3af3ba49c7e0fafb81bfdce

desktop/flipper-server-client/src/FlipperServerClient.tsx

@@ -47,7 +47,11 @@ export function createFlipperServerWithSocket(
     let initialConnectionTimeout: ReturnType<typeof setTimeout> | undefined =
       setTimeout(() => {
         reject(
-          new Error('Failed to connect to flipper-server in a timely manner'),
+          new Error(
+            `Failed to connect to the server in a timely manner.
+             It may be unresponsive. Run the following from the terminal 
+             'lsof -nP -iTCP -sTCP:LISTEN | grep 52342' and kill the listed process, if any.`,
+          ),
         );
       }, CONNECTION_TIMEOUT);