PHP 8.5 | UPGRADING: fix entry about new grapheme $locale parameter (php#20239)

* PHP 8.5 | UPGRADING: fix entry about new grapheme $locale parameter

1. The `grapheme_levenshtein()` function is new to PHP 8.5, so the `$locale` parameter being added does not "change" the function (in the context of changes between PHP 8.4 and 8.5).
2. The `grapheme_substr()` function has also been given the new `$locale` parameter, but was not listed in the changelog entry.

Refs:
* https://wiki.php.net/rfc/grapheme_levenshtein
* php@bdcea11
* https://wiki.php.net/rfc/grapheme_add_locale_for_case_insensitive
* php@ad75c26

* NEWS: Add missing parentheses after `grapheme_substr`

Co-authored-by: tekimen <[email protected]>

Author: jrfnl

NEWS

@@ -217,7 +217,7 @@ PHP                                                                        NEWS
 
 - Intl:
   . Added grapheme_strpos(), grapheme_stripos(), grapheme_strrpos(),
-    grapheme_strripos(), grapheme_strstr(), grapheme_stristr() and
+    grapheme_strripos(), grapheme_substr(), grapheme_strstr(), grapheme_stristr() and
     grapheme_levenshtein() functions add $locale parameter (Yuya Hamada).
   . Fixed bug GH-11952 (Fix locale strings canonicalization for IntlDateFormatter
     and NumberFormatter). (alexandre-daubois)

UPGRADING

@@ -613,8 +613,8 @@ PHP 8.5 UPGRADE NOTES
     have dropped the false from the return type union. Returning false
     was actually never possible.
   . grapheme_strpos(), grapheme_stripos(), grapheme_strrpos(),
-    grapheme_strripos(), grapheme_strstr(), grapheme_stristr() and
-    grapheme_levenshtein() functions add $locale parameter.
+    grapheme_strripos(), grapheme_substr(), grapheme_strstr()
+    and grapheme_stristr() functions add $locale parameter.
     RFC: https://wiki.php.net/rfc/grapheme_add_locale_for_case_insensitive
 
 - LDAP: