Updated the PR Request Template (#2097)

Instead of having the user replace the text, I put the directions in
comments, and put the checklist more into unique sections for Reviewer
and Commiter.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,31 +1,30 @@
 ## Purpose / why
-
-> _**Replace this text** - Restate the purpose/justification of this work and include links to any Issues or other discussions that are related to this work._
+<!-- Restate the purpose/justification of this work and include links to any Issues or other discussions that are related to this work. -->
 
 ## What changes were made?
-
-> _**Replace this text** - State clearly the direct additions or modifications made in this pull request._
+<!-- State clearly the direct additions or modifications made in this pull request. -->
 
 ## Verification
-
-> _**Replace this text** - Document the details that help a reviewer verify the documentation._
+<!-- Document the details that help a reviewer verify the documentation. -->
 
 ## Interested Parties
+<!-- Name some folks who may be interested, if documentation related mention @Islandora/documentation, or, if unsure, @Islandora/committers_ -->
 
-
-> _**Replace this text** - Name some folks who may be interested, if documentation related mention @Islandora/documentation, or, if unsure, @Islandora/committers_
-
----
+* @Islandora/documentation
+* @Islandora/committers
 
 ## Checklist
 
-> __Pull-request reviewer__ should ensure the following
+### Pull-request Reviewer
+Pull-request reviewer should ensure the following:
 
 * [ ] Does this PR link to related [issues](https://github.com/Islandora/documentation/issues/)?
 * [ ] Does the proposed documentation align with the [Islandora Documentation Style Guide](https://islandora.github.io/documentation/contributing/docs_style_guide/)?
 * [ ] Are the changes accurate, useful, free of typos, etc?
 
-> __Person merging__ should ensure the following
+### Person Merging
+The person merging should ensure the following:
+
 * [ ] Does mkdocs still build successfully? (This is indicated by TravisCI passing. To test locally, and see warnings, see [How To Build Documentation](https://islandora.github.io/documentation/technical-documentation/docs-build/).)
 * [ ] If pages are renamed or removed, have all internal links to those pages been fixed?
 * [ ] If pages are added, have they been linked to or placed in the menu?