docs: add note about use preference over useContext

[afgoulart]

Summary

Adds a note to the useContext documentation page informing developers that use is preferred over useContext because it is more flexible.

Details

This change addresses issue #7723 by adding a prominent note at the beginning of the useContext reference page, similar to what is already mentioned in the use documentation.

The note explains that:

• use is preferred over useContext
• use is more flexible because it can be called inside conditionals and loops
• Includes a link to the use API documentation

Test plan

Documentation change only - no code changes required.

Closes #7723

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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[afgoulart]

I'm Meta Develop. Can anybody re-run the Meta CLA Check?