Minor edits to pull request template (cartography-cncf#1337)

### Summary
> Describe your changes.

Small updates to PR template

.github/pull_request_template.md

@@ -9,17 +9,15 @@
 - https://github.com/lyft/cartography/issues/...
 
 
-### Proof that this works
-> We can merge your change in faster if we see that it works. For example, if making a change to the graph, include a
-> screenshot showing what the graph looked like before and after your changes. You can also include console log traces
-> showing what happened before and after your changes.
-
-
-
 ### Checklist
 
-- [ ] Update/add unit or integration tests
+Provide proof that this works (this makes reviews move faster). Please perform one or more of the following:
+- [ ] Update/add unit or integration tests.
+- [ ] Include a screenshot showing what the graph looked like before and after your changes.
+- [ ] Include console log trace showing what happened before and after your changes.
+
+If you are changing a node or relationship:
+- [ ] Update the [schema](https://github.com/lyft/cartography/tree/master/docs/root/modules) and [readme](https://github.com/lyft/cartography/blob/master/docs/schema/README.md).
 
-If you are modifying or implementing an intel module:
-- [ ] Update the [schema](https://github.com/lyft/cartography/tree/master/docs/root/modules) and [readme](https://github.com/lyft/cartography/blob/master/docs/schema/README.md)
-- [ ] Use the NodeSchema [data model](https://lyft.github.io/cartography/dev/writing-intel-modules.html#defining-a-node)
+If you are implementing a new intel module:
+- [ ] Use the NodeSchema [data model](https://lyft.github.io/cartography/dev/writing-intel-modules.html#defining-a-node).