chore(pull request template): add PR type (#1457)

## Summary

### Changes

- Add PR type to promote smaller PRs
- Changed wording

### User experience

No changes

## Checklist

If your change doesn't seem to apply, please leave them unchecked.

* [x] I have performed a self-review of this change according to the
[development
guidelines](https://splunk.github.io/addonfactory-ucc-generator/contributing/#development-guidelines)
* [ ] Changes have been
[tested](https://splunk.github.io/addonfactory-ucc-generator/contributing/#build-and-test)
* [ ] Changes are documented
* [x] PR title and description follows the [contributing
principles](https://splunk.github.io/addonfactory-ucc-generator/contributing/#pull-requests)

---------

Signed-off-by: Viktor Tsvetkov <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,20 +1,29 @@
 **Issue number:**
 
+### PR Type
+
+**What kind of change does this PR introduce?**
+* [ ] Feature
+* [ ] Bug Fix
+* [ ] Refactoring (no functional or API changes)
+* [ ] Documentation Update
+* [ ] Maintenance (dependency updates, CI, etc.)
+
 ## Summary
 
 ### Changes
 
-> Please provide a summary of what's being changed
+Please provide a summary of the changes.
 
 ### User experience
 
-> Please describe what the user experience looks like before and after this change
+Please describe the user experience before and after this change. Screenshots are welcome for additional context.
 
 ## Checklist
 
-If your change doesn't seem to apply, please leave them unchecked.
+If an item doesn't apply to your changes, leave it unchecked.
 
 * [ ] I have performed a self-review of this change according to the [development guidelines](https://splunk.github.io/addonfactory-ucc-generator/contributing/#development-guidelines)
-* [ ] Changes have been [tested](https://splunk.github.io/addonfactory-ucc-generator/contributing/#build-and-test)
+* [ ] Tests have been added/modified to cover the changes [(testing doc)](https://splunk.github.io/addonfactory-ucc-generator/contributing/#build-and-test)
 * [ ] Changes are documented
 * [ ] PR title and description follows the [contributing principles](https://splunk.github.io/addonfactory-ucc-generator/contributing/#pull-requests)