Update PULL_REQUEST_TEMPLATE.md

Some Markdown related fixes, and adding a missing word.

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,16 +9,16 @@
 - [ ] I have read the [contributing guidelines](https://github.com/eslint/eslint/blob/master/CONTRIBUTING.md).
 - [ ] The team has reached consensus on the changes proposed in this pull request. If not, I understand that the evaluation process will begin with this pull request and won't be merged until the team has reached consensus.
 
-#### What is the purpose of this pull request? (put an "X" next to item)
-
-[ ] Documentation update
-[ ] Bug fix ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/bug-report.md))
-[ ] New rule ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/rule-proposal.md))
-[ ] Changes an existing rule ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/rule-change-proposal.md))
-[ ] Add autofixing to a rule
-[ ] Add a CLI option
-[ ] Add something to the core
-[ ] Other, please explain:
+#### What is the purpose of this pull request? (put an "X" next to an item)
+
+- [ ] Documentation update
+- [ ] Bug fix ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/bug-report.md))
+- [ ] New rule ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/rule-proposal.md))
+- [ ] Changes an existing rule ([template](https://raw.githubusercontent.com/eslint/eslint/master/templates/rule-change-proposal.md))
+- [ ] Add autofixing to a rule
+- [ ] Add a CLI option
+- [ ] Add something to the core
+- [ ] Other, please explain:
 
 <!--
     If the item you've checked above has a template, please paste the template questions below and answer them. (If this pull request is addressing an issue, you can just paste a link to the issue here instead.)