Update docs/test-and-publish/test/test-on-mobile-device.md

Co-authored-by: Pooja Bhaumik <[email protected]>

Author: pinkeshmars

docs/test-and-publish/test/test-on-mobile-device.md

@@ -65,7 +65,7 @@ Once downloaded, open the project in your preferred IDE and run your app on eith
 If you encounter a version compatibility issue with Flutter, you can resolve it by upgrading to the latest version. Simply execute the `flutter upgrade` command in your terminal. To verify your current Flutter version, use the `flutter --version` command.
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-## Building APK Files
+## Building APK File
 
 You can build APK files locally to test your app on Android devices or prepare it for release on the Google Play Store.