Add changelog and documentation to PR chore list

[antonwolfy]

The PR proposes to extend the PR chore list with changelog and documentation notes.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you filing the PR as a draft?

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev0=py312he4f9c94_6 ran successfully.
Passed: 1004
Failed: 0
Skipped: 10

[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[coveralls]

coverage: 71.883%. remained the same
when pulling 242db5e on add-changelog-update-pr-chores
into 91cad0c on master.