docs(pr-template): minor changes to pr template

Remove heading
Update closes issue to conform to the spec
fix grammary

.github/pull_request_template.md

@@ -1,8 +1,6 @@
-# Pull request
-
-This pull request closes issue: #XXX
+This pull request resolves #XXX
 
  - [ ] I have read and agreed to the [code of conduct](https://github.com/movie-web/movie-web/blob/dev/.github/CODE_OF_CONDUCT.md).
  - [ ] I have read and complied with the [contributing guidelines](https://github.com/movie-web/movie-web/blob/dev/.github/CONTRIBUTING.md).
- - [ ] What I'm implementing was assigned to me and is an [approved issue](https://github.com/movie-web/movie-web/issues?q=is%3Aopen+is%3Aissue+label%3Aapproved). For reference see our [GitHub projects](https://github.com/movie-web/movie-web/projects).
+ - [ ] What I'm implementing was assigned to me and is an [approved issue](https://github.com/movie-web/movie-web/issues?q=is%3Aopen+is%3Aissue+label%3Aapproved). For reference, please take a look at our [GitHub projects](https://github.com/movie-web/movie-web/projects).
  - [ ] I have tested all of my changes.