Add tag to SO link

Author: guardrex

.github/ISSUE_TEMPLATE/blank-issue.md

@@ -16,7 +16,7 @@ If the issue is:
 
 * A simple typo or similar correction, you can submit a PR. See [the contributor guide](https://docs.microsoft.com/contribute/#quick-edits-to-existing-documents) for instructions.
 * A general support question, consider asking on a support forum site:
-  * [Stack Overflow](https://stackoverflow.com/questions)
+  * [Stack Overflow](https://stackoverflow.com/questions/tagged/asp.net-core)
   * [ASP.NET Core Slack](https://aspnetcore.slack.com/join/shared_invite/zt-1mv5487zb-EOZxJ1iqb0A0ajowEbxByQ#/shared-invite/email)
   * [ASP.NET Gitter](https://gitter.im/aspnet/Home)
 * A site design concern, create an issue at [MicrosoftDocs/Feedback](https://github.com/MicrosoftDocs/Feedback/issues/new/choose).