chore: Add note about copyrights on PR checklist

.github/pull_request_template.md

@@ -3,7 +3,7 @@
  - [ ] This board/shield is tested working on real hardware
  - [ ] Definitions follow the general style of other shields/boards upstream ([Reference](https://zmk.dev/docs/development/new-shield))
  - [ ] `.zmk.yml` metadata file added
- - [ ] Proper Copyright + License headers added to applicable files
+ - [ ] Proper Copyright + License headers added to applicable files (Generally, we stick to "The ZMK Contributors" for copyrights to help avoid churn when files get edited)
  - [ ] General consistent formatting of DeviceTree files
  - [ ] Keymaps do not use deprecated key defines (Check using the [upgrader tool](https://zmk.dev/docs/codes/keymap-upgrader))
  - [ ] `&pro_micro` used in favor of `&pro_micro_d/a` if applicable