improve pull request template

docs/pull_request_template.md

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+## Changes description
+
+
+## Review checklist
+- [ ] I have checked that my pull request's code does run flawlessly on the hardware platform under its latest firmware version before opening this pull request for review.
+
+## Licensing and copyright checklist
+- [ ] I accept that the copyright of my contribution is transferred to the contributors of this repository.
+- [ ] I agree that my contribution may be published under the AGPL-3.0-or-later license.