ci: PULL_REQUEST_TEMPLATE.md checklist wording

[sliedig]

What were you searching in the docs?

PULL_REQUEST_TEMPLATE

Is this related to an existing documentation section?

No response

How can we improve?

Fix wording in checklist

Got a suggestion in mind?

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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