docs: replace string[pyarrow] with Arrow-backed in whatsnew

Author: Alvaro-Kothe

doc/source/whatsnew/v2.3.3.rst

@@ -22,7 +22,7 @@ become the default string dtype in pandas 3.0. See
 
 Bug fixes
 ^^^^^^^^^
-- Fix bug in :meth:`Series.str.replace` using named capture groups (e.g., ``\g<name>``) with ``string[pyarrow]`` dtype would raise an error (:issue:`57636`)
+- Fix bug in :meth:`Series.str.replace` using named capture groups (e.g., ``\g<name>``) with the Arrow-backed dtype would raise an error (:issue:`57636`)
 - Fix regression in ``~Series.str.contains``, ``~Series.str.match`` and ``~Series.str.fullmatch``
   with a compiled regex and custom flags (:issue:`62240`)