Add tip for running eslintfix

Release-Notes: skip
Change-Id: I83c7676a337dc8410b748d71e084b25050fafaa0
diff --git a/polygerrit-ui/README.md b/polygerrit-ui/README.md
index ac51959..fc7bfba 100644
--- a/polygerrit-ui/README.md
+++ b/polygerrit-ui/README.md
@@ -233,6 +233,12 @@
 yarn eslint
 ```
 
+* To run ESLint and apply changes on the whole app:
+
+```sh
+yarn eslintfix
+```
+
 * To run ESLint on just the subdirectory you modified:
 
 ```sh