ci: long-lines format, maybe avoid odd rendering in PR template (#5376)

* semantic newlines, maybe avoid odd rendering

* Simplify CI instructions in pull request template

* Update .github/pull_request_template.md

Co-authored-by: David Hewitt <[email protected]>

---------

Co-authored-by: David Hewitt <[email protected]>

Author: altendky

.github/pull_request_template.md

@@ -9,6 +9,4 @@ Please consider adding the following to your pull request:
  - docs to all new functions and / or detail in the guide
  - tests for all new or changed functions
 
-PyO3's CI pipeline will check your pull request, thus make sure you have checked the `Contributing.md` guidelines. To run most of its tests
-locally, you can run ```nox```. See ```nox --list-sessions```
-for a list of supported actions.
+PyO3's CI pipeline will check your pull request, thus make sure you have checked the `Contributing.md` guidelines. To run most of its tests locally, you can run `nox`. See `nox --list-sessions` for a list of supported actions.