Fix typo: "comitting" → "committing" in your-first-pr-checklist.md

[mergeworthy]

A heading in the "Your first PR checklist" guide spells comitting with one t — should be committing.

Where

guides/your-first-pr-checklist.md, the section heading near the top:

Pre-flight: before comitting

What it should say

Pre-flight: before committing

Acceptance criteria

• comitting is replaced with committing in the heading.
• No other text in the file is changed.
• The PR is small and focused.

Estimated time

~5 minutes.

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[guvennsade-tech]

Fixed in #32

[guvennsade-tech]

Fixed in #32