chore(pr-template): Reformat PR template

.github/pull_request_template.md

@@ -1,18 +1,15 @@
 ## Problem
-<!-- Who are we building for, what are their needs, why is this important? -->
 
+<!-- Who are we building for, what are their needs, why is this important? -->
 
 ## Changes
-<!-- 
-If this affects the frontend, include screenshots of your solution. 
-If this is based on a reference design, include a link to the relevant Figma frame! 
--->
-👉 *Stay up-to-date with our [coding conventions](https://posthog.com/docs/contribute/coding-conventions) for a smoother review.*
 
+<!-- If there are frontend changes, please include screenshots. -->
+<!-- If a reference design was involved, include a link to the relevant Figma frame! -->
+
+👉 *Stay up-to-date with [PostHog coding conventions](https://posthog.com/docs/contribute/coding-conventions) for a smoother review.*
 
 ## How did you test this code?
-<!-- 
-Briefly describe the steps you took. 
-If the answer is manually, please include a quick step-by-step on how to test this PR. 
--->
 
+<!-- Briefly describe the steps you took. -->
+<!-- Include automated tests if possible, otherwise describe the manual testing routine. -->