gh-150524: Fix note in binascii.a2b_hex documentation

`bytes.fromhex` accepts ASCII bytes and bytes-like objects as input since 3.14

Author: Joshix-1

Doc/library/binascii.rst

@@ -367,9 +367,8 @@ The :mod:`!binascii` module defines the following functions:
    *ignorechars* should be a :term:`bytes-like object` containing characters
    to ignore from the input.
 
-   Similar functionality (accepting only text string arguments, but more
-   liberal towards whitespace) is also accessible using the
-   :meth:`bytes.fromhex` class method.
+   Similar functionality (more liberal towards whitespace) is also accessible
+   using the :meth:`bytes.fromhex` class method.
 
    .. versionchanged:: 3.15
       Added the *ignorechars* parameter.