[in_app_purchase_storekit] Updated comment

[avni-prajapati]

Updated the comment refer to StoreKit instead of Android, in example/lib/main.dart

Before

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  // When using the Android plugin directly it is mandatory to register
  // the plugin as default instance as part of initializing the app.
  InAppPurchaseStoreKitPlatform.registerPlatform();

After

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  // When using the StoreKit plugin directly it is mandatory to register
  // the plugin as default instance as part of initializing the app.
  InAppPurchaseStoreKitPlatform.registerPlatform();

Issue

Closes flutter/flutter#159623

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under¹.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style, or I have commented below to indicate which CHANGELOG exemption this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

Footnotes

1. Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩ ↩² ↩³

[LongCatIsLooong]

RSLGTM, thanks for the fix!

[stuartmorgan-g]

From triage: @LouiseHsu This still needs a secondary review to land.