PR template Contribution Guidelines link doesn't work (#136)

* Fix template relative URLs.

* Update .github/PULL_REQUEST_TEMPLATE.md

Co-authored-by: Xiaodi Wu <13952+xwu@users.noreply.github.com>

* Fix indent

Co-authored-by: Xiaodi Wu <13952+xwu@users.noreply.github.com>

Author: LemonSpike

.github/PULL_REQUEST_TEMPLATE.md

@@ -17,5 +17,5 @@ Replace this paragraph with a description of your changes and rationale. Provide
 ### Checklist
 - [ ] I've added at least one test that validates that my change is working, if appropriate
 - [ ] I've followed the code style of the rest of the project
-- [ ] I've read the [Contribution Guidelines](../CONTRIBUTING.md)
+- [ ] I've read the [Contribution Guidelines](../blob/main/CONTRIBUTING.md)
 - [ ] I've updated the documentation if necessary

.github/PULL_REQUEST_TEMPLATE/NEW.md

@@ -34,5 +34,5 @@ What is the impact of this change on existing users? Does it deprecate or remove
 ### Checklist
 - [ ] I've added at least one test that validates that my change is working, if appropriate
 - [ ] I've followed the code style of the rest of the project
-- [ ] I've read the [Contribution Guidelines](../../CONTRIBUTING.md)
+- [ ] I've read the [Contribution Guidelines](../../blob/main/CONTRIBUTING.md)
 - [ ] I've updated the documentation if necessary