Fix grammar error in index documentation

[YashasviniSingh]

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Description

This PR fixes a small grammar issue in docs/index.md.
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📚 Documentation preview 📚: https://plone6--2019.org.readthedocs.build/

[boring-cyborg]

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[stevepiercy]

@YashasviniSingh thank you! Because this PR is a trivial grammar fix, we don't require your permission to publish, so we can bypass the Plone Contributor Agreement and permission statement.

However, it doesn't fix any previously reported issue, so I removed that from the description to prevent it from being closed automatically. Please use more care and only include issue numbers that a PR should close.

[boring-cyborg]

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[YashasviniSingh]

Thank you for the review and the clarification . Thank you for the guidance also.