Link bump type documentation in PR template

Update the PR checklist links to use full GitHub URLs instead of
relative paths so they work reliably when rendered in PR descriptions.

Author: alfonso-noriega

.github/PULL_REQUEST_TEMPLATE.md

@@ -41,4 +41,4 @@ Fixes #0000 <!-- link to issue if one exists -->
 - [ ] I've considered possible cross-platform impacts (Mac, Linux, Windows)
 - [ ] I've considered possible [documentation](https://shopify.dev) changes
 - [ ] I've considered analytics changes to measure impact
-- [ ] The change is user-facing — I've identified the correct bump type (`patch` for bug fixes · `minor` for new features · `major` for [breaking changes](../CONTRIBUTING.md#what-counts-as-a-breaking-change)) and added a changeset with `pnpm changeset add`
+- [ ] The change is user-facing — I've identified the correct [bump type](https://github.com/Shopify/cli/blob/main/CONTRIBUTING.md#choosing-the-right-bump-type) (`patch` for bug fixes · `minor` for new features · `major` for [breaking changes](https://github.com/Shopify/cli/blob/main/CONTRIBUTING.md#what-counts-as-a-breaking-change)) and added a changeset with `pnpm changeset add`