We don't need the link in the template

It shows up on the new issue page.

Author: shana

ISSUE_TEMPLATE.md

@@ -1,6 +1,6 @@
-Hello! Please read the guidelines at https://github.com/github/VisualStudio/blob/master/CONTRIBUTING.md#submitting-an-issue before submitting an issue.
+Hello! Please read the contributing guidelines before submitting an issue.
 
 - GitHub Extension version:
 - Visual Studio version:
 
-### What happened (with steps, logs and screenshots, if possible)
+__What happened__ (with steps, logs and screenshots, if possible)