WebKit iOS xcode15.0 b2

#WebKit.framework https://github.com/xamarin/xamarin-macios/pull/19237

diff -ruN /Applications/Xcode_15.0.0-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/WebKit.framework/Headers/WKWebsiteDataStore.h /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/WebKit.framework/Headers/WKWebsiteDataStore.h
--- /Applications/Xcode_15.0.0-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/WebKit.framework/Headers/WKWebsiteDataStore.h	2023-06-01 05:24:17
+++ /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/WebKit.framework/Headers/WKWebsiteDataStore.h	2023-06-15 02:02:05
@@ -101,7 +101,7 @@
  @discussion This should be called when the data store is not used any more. Returns error if removal fails
  to complete. WKWebView using the data store must be released before removal.
 */
-+ (void)removeDataStoreForIdentifier:(NSUUID *)identifier completionHandler:(void(^)(NSError *))completionHandler API_AVAILABLE(macos(NA), ios(17.0));
++ (void)removeDataStoreForIdentifier:(NSUUID *)identifier completionHandler:(void(^)(NSError * _Nullable))completionHandler API_AVAILABLE(macos(NA), ios(17.0));
 
 /*! @abstract Fetch all data stores identifiers.
  @param completionHandler A block to invoke with an array of identifiers when the operation completes.