Fix grammatical errors in company handbook introduction

[clizbe]

"reflective of our collective" has a weird ring to it

Changes Proposed in This Pull Request

Some grammar changes

Checklist

• I have checked the Deploy Preview link in the netlify bot's comment, and my changes look good
• I tested my contribution locally, and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• If new pages are added, maintainers are assigned for that document.
• If the document falls under a controlled category, a controlled document banner is present.

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