message: docs: fix formatting of PULL_REQUEST_TEMPLATE.md
  This change enables developers to check the checkboxes or update them
  after they submitted a PR.
  PR Close
diff: @@ -10,17 +10,17 @@ Please check if your PR fulfills the following requirements:
  What kind of change does this PR introduce?
  <!-- Please check the one that applies to this PR using "x". -->
  -```
  -[ ] Bugfix
  -[ ] Feature
  -[ ] Code style update (formatting, local variables)
  -[ ] Refactoring (no functional changes, no api changes)
  -[ ] Build related changes
  -[ ] CI related changes
  -[ ] Documentation content changes
  -[ ] angular.io application / infrastructure changes
  -[ ] Other... Please describe:
  -```
  +
  +- [ ] Bugfix
  +- [ ] Feature
  +- [ ] Code style update (formatting, local variables)
  +- [ ] Refactoring (no functional changes, no api changes)
  +- [ ] Build related changes
  +- [ ] CI related changes
  +- [ ] Documentation content changes
  +- [ ] angular.io application / infrastructure changes
  +- [ ] Other... Please describe:
  +
  ## What is the current behavior?
  <!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
  @@ -32,10 +32,10 @@ Issue Number: N/A
  ## Does this PR introduce a breaking change?
  -```
  -[ ] Yes
  -[ ] No
  -```
  +
  +- [ ] Yes
  +- [ ] No
  +
  <!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
  