Fix description for "Content-intellisense" VSC extension setting

[RomanHauksson]

Changes

• The description of this setting refers to the relevant Astro configuration file option as "experimental.contentCollectionIntellisense". This is incorrect; I changed it to say "experimental.contentIntellisense".
• Grammar fix ("require" → "requires")

Testing

No tests were added, this is just a documentation fix.

Docs

No docs were added, this is just a documentation fix.

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Latest commit: 013907e

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[Princesseuh]

Hello! This repo will be archived next week as its content has been merged into the main monorepo. Could you do the same PR there?

[RomanHauksson]

Done! withastro/astro#14710