fix(astro-i18n): update wrong locale code (#12677)

Co-authored-by: trueberryless <[email protected]>
Co-authored-by: Armand Philippot <[email protected]>

Author: 3 people

src/content/docs/en/reference/modules/astro-i18n.mdx

@@ -356,7 +356,7 @@ Replaces underscores (`_`) with hyphens (`-`) in the given locale before returni
 import { normalizeTheLocale } from "astro:i18n";
 
 normalizeTheLocale("it_VT") // returns `it-vt`
-// Assuming the current locale is `"pt-PR"`:
+// Assuming the current locale is `"pt-PT"`:
 normalizeTheLocale(Astro.currentLocale) // returns `pt-pt`
 ---
 ```