Merge pull request swiftlang#27851 from apple/shahmishal/pr-autolinking

Update PR template to use autolinking feature

Author: shahmishal

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,7 @@
 Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
 
 <!-- If this pull request resolves any bugs in the Swift bug tracker, provide a link: -->
-Resolves [SR-NNNN](https://bugs.swift.org/browse/SR-NNNN).
+Resolves SR-NNNN.
 
 <!--
 Before merging this pull request, you must run the Swift continuous integration tests.