docs: improve the opening sentence's clarity

[oluwatobiss]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

The current opening sentence of the Contributing Guide could be clearer. Here's a comparison of the existing text and the proposed:

• Existing: Docusaurus is our way to hopefully help to create open source documentation easier.
• Proposed: Docusaurus is our way to hopefully help make open source documentation easier.

Test Plan

N/A (This is a doc update)

Test links

Deploy preview: https://deploy-preview-9177--docusaurus-2.netlify.app/

Related issues/PRs

N/A

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 87	🟢 97	🟠 83	🟢 100	🟠 89	Report
/docs/installation	🟠 77	🟢 100	🟠 83	🟢 100	🟠 89	Report