Update captcha.mdx

[liyunze-coding]

Description

Fixed reCAPTCHA documentation error.

This guide uses reCAPTCHA v2 (not v3) and specifically the Invisible reCAPTCHA badge.

(Discord user: RythonDev)

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Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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