[in_app_purchase] [#135759] Fix. doc reference finishPurchase to completePurchase. (#5081)

## What type of PR is this? (check all applicable)

## Description
finishPurchase was mentioned in the doc, but does not exist in the package, instead completePurchase is used now, so updating the comment link.

## Fix
Updated finishPurchase to completePurchase. 

## Related Tickets & Documents

- Closes [#135769](flutter/flutter#135759)

Author: droidbg

packages/in_app_purchase/in_app_purchase/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.1.11
+
+* Updates documentation reference of `finishPurchase` to `completePurchase`.
+
 ## 3.1.10
 
 * Updates example code for current versions of Flutter.

packages/in_app_purchase/in_app_purchase/lib/in_app_purchase.dart

@@ -195,7 +195,7 @@ class InAppPurchase implements InAppPurchasePlatformAdditionProvider {
   /// Restored purchases are delivered through the [purchaseStream] with a
   /// status of [PurchaseStatus.restored]. You should listen for these purchases,
   /// validate their receipts, deliver the content and mark the purchase complete
-  /// by calling the [finishPurchase] method for each purchase.
+  /// by calling the [completePurchase] method for each purchase.
   ///
   /// This does not return consumed products. If you want to restore unused
   /// consumable products, you need to persist consumable product information

packages/in_app_purchase/in_app_purchase/pubspec.yaml

@@ -2,7 +2,7 @@ name: in_app_purchase
 description: A Flutter plugin for in-app purchases. Exposes APIs for making in-app purchases through the App Store and Google Play.
 repository: https://github.com/flutter/packages/tree/main/packages/in_app_purchase/in_app_purchase
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+in_app_purchase%22
-version: 3.1.10
+version: 3.1.11
 
 environment:
   sdk: ">=2.19.0 <4.0.0"

packages/in_app_purchase/in_app_purchase_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.3.6
+
+* Updates documentation reference of `finishPurchase` to `completePurchase`.
+
 ## 1.3.5
 
 * Adds pub topics to package metadata.

packages/in_app_purchase/in_app_purchase_platform_interface/lib/src/in_app_purchase_platform.dart

@@ -182,7 +182,7 @@ abstract class InAppPurchasePlatform extends PlatformInterface {
   /// Restored purchases are delivered through the [purchaseStream] with a
   /// status of [PurchaseStatus.restored]. You should listen for these purchases,
   /// validate their receipts, deliver the content and mark the purchase complete
-  /// by calling the [finishPurchase] method for each purchase.
+  /// by calling the [completePurchase] method for each purchase.
   ///
   /// This does not return consumed products. If you want to restore unused
   /// consumable products, you need to persist consumable product information

packages/in_app_purchase/in_app_purchase_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@ repository: https://github.com/flutter/packages/tree/main/packages/in_app_purcha
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+in_app_purchase%22
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 1.3.5
+version: 1.3.6
 
 environment:
   sdk: ">=2.19.0 <4.0.0"