If you're not sure what to write, here's a bit of an outline to get you started. No requirement to conform though if you're comfortable prodviding some appropriate info.
Title / short summary of the changes in this PR
Prior to this PR ____ / how things were and why things needed to change
After this PR ____ / how things have changed
Note design decisions / anything that may not be immediately evident when reading the diffs
If you're not sure what to write, here's a bit of an outline to get you started. No requirement to conform though if you're comfortable prodviding some appropriate info.