Refine copy for PR template and add a release-note code fence (#1678)

Signed-off-by: Stephen Augustus <foo@auggie.dev>

Author: justaugustus

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,21 +1,48 @@
-* **Please check if the PR fulfills these requirements**
-- [ ] Tests for the changes have been added (for bug fixes / features)
-- [ ] PR title follows the guidelines defined in  https://github.com/ossf/scorecard/blob/main/CONTRIBUTING.md#pr-process
+#### What kind of change does this PR introduce?
 
-* **What kind of change does this PR introduce?** (Bug fix, feature, docs update, ...)
+(Is it a bug fix, feature, docs update, something else?)
 
+- [ ] PR title follows the guidelines defined in our [pull request documentation](https://github.com/ossf/scorecard/blob/main/CONTRIBUTING.md#pr-process)
 
+#### What is the current behavior?
 
-* **What is the current behavior?** (You can also link to an open issue here)
+#### What is the new behavior (if this is a feature change)?**
 
+- [ ] Tests for the changes have been added (for bug fixes/features)
 
+#### Which issue(s) this PR fixes
 
-* **What is the new behavior (if this is a feature change)?**
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
 
+Fixes #
 
+or
 
-* **Does this PR introduce a breaking change?** (What changes might users need to make in their application due to this PR?)
+NONE
+-->
 
+#### Special notes for your reviewer
 
+#### Does this PR introduce a user-facing change?
 
-* **Other information**:
+For user-facing changes, please add a concise, human-readable release note to
+the `release-note`
+
+(In particular, describe what changes users might need to make in their
+application as a result of this pull request.)
+
+<!--
+If no, just write "NONE" in the release-note block below.
+If yes, a release note is required:
+Enter your extended release note in the block below.
+If the PR requires additional action from users switching to the new release,
+include the string "ACTION REQUIRED".
+
+For more information on release notes see: https://git.k8s.io/release/cmd/release-notes/README.md
+-->
+
+```release-note
+
+```