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Update NEXT_LOCALE cookie note (#22736)

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This updates the `NEXT_LOCALE` cookie docs to mention how it is used for redirecting from `/` more specifically. 

x-ref: https://github.com/vercel/next.js/pull/20045#discussion_r586158535
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JJ Kasper 2021-03-03 13:30:01 -06:00 committed by GitHub
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docs/advanced-features/i18n-routing.md
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@ -217,9 +217,9 @@ export default function IndexPage(props) {
## Leveraging the NEXT_LOCALE cookie
Next.js supports overriding the accept-language header with a `NEXT_LOCALE=the-locale` cookie. This cookie can be set using a language switcher and then when a user comes back to the site it will leverage the locale specified in the cookie.
Next.js supports overriding the accept-language header with a `NEXT_LOCALE=the-locale` cookie. This cookie can be set using a language switcher and then when a user comes back to the site it will leverage the locale specified in the cookie when redirecting from `/` to the correct locale location.
For example, if a user prefers the locale `fr` but a `NEXT_LOCALE=en` cookie is set the `en` locale will be used instead until the cookie is removed or expired.
For example, if a user prefers the locale `fr` in their accept-language header but a `NEXT_LOCALE=en` cookie is set the `en` locale when visiting `/` the user will be redirected to the `en` locale location until the cookie is removed or expired.
## Search Engine Optimization