docs: fix missing preposition and phrasing in CONTRIBUTING.md

[amir-rezaei]

Description

This PR fixes minor phrasing and a missing preposition in CONTRIBUTING.md.

Details

1. Added missing infinitive preposition to (want help -> want to help).
2. Corrected informal phrasing (If you wanna -> If you want).

[github-actions]

Signed commits report

1 of 1 commit between main and docs/fix-contributing-phrasing could not be fully verified:

Commit	Author	Reason	Message
4e8738aa	ferkans-amir	unsigned	docs: fix missing preposition and phrasing in CONTRIBUTING.md

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[Copilot]

Pull request overview

This PR updates CONTRIBUTING.md to improve contributor-facing wording by fixing a missing “to” in an infinitive phrase and replacing informal phrasing with a more formal alternative.

Changes:

• Fixed grammar: “want help” → “want to help”.
• Replaced informal “wanna” with “want” for more professional tone.

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[adamyeats]

Good change @amir-rezaei , thanks! 🚢

[adamyeats]

@amir-rezaei Please GPG sign your commits and rebase from main so that we can merge this in!