Clarify line number instructions

Signed-off-by: J. Ryan Stinnett <jryans@gmail.com>

src/vector/rageshakesetup.js

@@ -30,7 +30,9 @@ import SdkConfig from "matrix-react-sdk/src/SdkConfig";
 
 function initRageshake() {
     rageshake.init().then(() => {
-        console.log("Initialised rageshake: See https://bugs.chromium.org/p/chromium/issues/detail?id=583193 to fix line numbers on Chrome.");
+        console.log("Initialised rageshake.");
+        console.log("To fix line numbers in Chrome: " +
+            "Meatball menu → Settings → Blackboxing → Add /rageshake\\.js$");
 
         window.addEventListener('beforeunload', (e) => {
             console.log('riot-web closing');