docs: added additional note

Author: y-hsgw

docs/rules/valid-expect.md

@@ -6,6 +6,9 @@
 🔧 This rule is automatically fixable by the
 [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
 
+Note: Test function will be fixed if it is async and does not have await in the
+async assertion.
+
 <!-- end auto-generated rule header -->
 
 Ensure `expect()` is called with a single argument and there is an actual