Fix typo in dev-build-watcher.js (#25196)

transtion -> transition

Author: Ikko Ashimine

packages/next/client/dev/dev-build-watcher.js

@@ -66,7 +66,7 @@ export default function initializeBuildWatcher(toggleCallback) {
       case 'built':
       case 'sync':
         isBuilding = false
-        // Wait for the fade out transtion to complete
+        // Wait for the fade out transition to complete
         timeoutId = setTimeout(() => {
           isVisible = false
           updateContainer()