:memo: Remove unused link reference

[ci skip]

docs/tutorial/mac-app-store-submission-guide.md

@@ -183,6 +183,5 @@ ERN)][ern-tutorial].
 [create-record]: https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/CreatingiTunesConnectRecord.html
 [submit-for-review]: https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/SubmittingTheApp.html
 [app-sandboxing]: https://developer.apple.com/app-sandboxing/
-[issue-3871]: https://github.com/electron/electron/issues/3871
 [ern-tutorial]: https://carouselapps.com/2015/12/15/legally-submit-app-apples-app-store-uses-encryption-obtain-ern/
 [temporary-exception]: https://developer.apple.com/library/mac/documentation/Miscellaneous/Reference/EntitlementKeyReference/Chapters/AppSandboxTemporaryExceptionEntitlements.html