docs: Fix typos in CONTRIBUTING.md

[nikohoffren]

Fixed typos in CONTRIBUTING.md.

This line:
By participating, you are expected to uphold this code. Please file issue to report unacceptable behavior.
changed to:
By participating, you are expected to uphold this code. Please file an issue to report unacceptable behavior.

Added space after comma in this line:
Unfortunately,the yalc publish command cannot pass multiple packages.
changed to:
Unfortunately, the yalc publish command cannot pass multiple packages.

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Latest commit: ff56ec0

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