Fix typo in e2e-simple.sh comment (#4323)

Author: bmuenzenmeyer

tasks/e2e-simple.sh

@@ -274,7 +274,7 @@ exists build/static/css/*.css
 exists build/static/media/*.svg
 exists build/favicon.ico
 
-# Run tests, overring the watch option to disable it.
+# Run tests, overriding the watch option to disable it.
 # `CI=true yarn test` won't work here because `yarn test` becomes just `jest`.
 # We should either teach Jest to respect CI env variable, or make
 # `scripts/test.js` survive ejection (right now it doesn't).