docs: refine i18n documentation by removing redundant text in regional language variants tip

Author: SerVitasik

adminforth/documentation/docs/tutorial/07-Plugins/10-i18n.md

@@ -49,7 +49,7 @@ model translations {
 
 If you want more languages, just add more fields like `uk_string`, `ja_string`, `fr_string`, `es_string` to the model.
 
-> 💡 **Tip**: For regional language variants, you can also use BCP47 codes like `en-GB`, `pt-BR`, `fr-CA` and add corresponding fields like `enGB_string`, `ptBR_string`, `frCA_string`. See the [BCP47 Language Code Support](#bcp47-language-code-support) section for more details.
+> 💡 **Tip**: For regional language variants, you can also use BCP47 codes like `en-GB`, `pt-BR`, `fr-CA` and add corresponding fields like `enGB_string`, `ptBR_string`, `frCA_string`.
 
 Next, add resource for translations: