Update firebase-functions/CHANGELOG.md

Co-authored-by: Daymon <[email protected]>

Author: rlazo

firebase-functions/CHANGELOG.md

@@ -1,5 +1,5 @@
 # Unreleased
-* [fixed] Fixed an issue that prevented the App Check token to be handled correctly in case of error.
+* [fixed] Fixed an issue that prevented the App Check token from being handled correctly in case of error.
 
 # 21.1.1
 * [fixed] Resolve Kotlin migration visibility issues