fix: add note to Intl.DisplayNames#of about Chromium browsers (#36564)

* add note to Intl.DisplayNames.of about Chrome

* Update files/en-us/web/javascript/reference/global_objects/intl/displaynames/of/index.md

Co-authored-by: Joshua Chen <[email protected]>

---------

Co-authored-by: Joshua Chen <[email protected]>

files/en-us/web/javascript/reference/global_objects/intl/displaynames/of/index.md

@@ -23,7 +23,7 @@ of(code)
 
   - : The `code` to provide depends on the `type`:
 
-    - If the type is "region", `code` should be either an [two-letter ISO 3166 region code](https://www.iso.org/iso-3166-country-codes.html), or a [three-digit UN M49 geographic region](https://unstats.un.org/unsd/methodology/m49/). It is required to follow the [`unicode_region_subtag`](https://unicode.org/reports/tr35/#unicode_region_subtag) grammar.
+    - If the type is "region", `code` should be either an [two-letter ISO 3166 region code](https://www.iso.org/iso-3166-country-codes.html), or a [three-digit UN M49 geographic region](https://unstats.un.org/unsd/methodology/m49/). It is required to follow the [`unicode_region_subtag`](https://unicode.org/reports/tr35/#unicode_region_subtag) grammar. Use uppercase codes (e.g., `"US"`), because lowercase ones (e.g., `"us"`) may not work reliably everywhere.
     - If the type is "script", `code` should be an [four-letter ISO 15924 script code](https://unicode.org/iso15924/iso15924-codes.html). It is required to follow the [`unicode_script_subtag`](https://unicode.org/reports/tr35/#unicode_script_subtag) grammar.
     - If the type is "language", `code` should be matched by the [`unicode_language_id`](https://unicode.org/reports/tr35/#Unicode_language_identifier) nonterminal.
     - If the type is "currency", `code` should be a [three-letter ISO 4217 currency code](https://www.iso.org/iso-4217-currency-codes.html). It is required to have exactly three alphabetic characters.