PULL_REQUEST_TEMPLATE: change order of titles (#13174)

PULL_REQUEST_TEMPLATE.md

@@ -1,16 +1,17 @@
 Please use [PX4 Discuss](http://discuss.px4.io/) or [Slack](http://slack.px4.io/) to align on pull requests if necessary. You can then open draft pull requests to get early feedback.
 
-**Describe problem solved by the proposed pull request**
+**Describe problem solved by this pull request**
-A clear and concise description of the problem this proposed change will solve. E.g. For this use case I ran into...
+A clear and concise description of the problem this proposed change will solve.
+E.g. For this use case I ran into...
 
-**Test data / coverage**
+**Describe your solution**
-How was it tested? What cases were covered? Logs uploaded to https://review.px4.io/ and screenshots of the important plot parts.
-
-**Describe your preferred solution**
 A clear and concise description of what you have implemented.
 
 **Describe possible alternatives**
 A clear and concise description of alternative solutions or features you've considered.
 
+**Test data / coverage**
+How was it tested? What cases were covered? Logs uploaded to https://review.px4.io/ and screenshots of the important plot parts.
+
 **Additional context**
 Add any other related context or media.