array-map.xml Change the misleading wording (php#4802)

* array-map.xml Change the misleading wording

Keys of input arrays are ignored. The function only considers the sequential order of elements (as determined by their internal pointers), not their indices

* Update reference/array/functions/array-map.xml

Co-authored-by: Kamil Tekiela <tekiela246@gmail.com>

---------

Co-authored-by: Kamil Tekiela <tekiela246@gmail.com>

Author: mmalferov

reference/array/functions/array-map.xml

@@ -41,7 +41,8 @@
       <para>
        &null; can be passed as a value to <parameter>callback</parameter>
        to perform a zip operation on multiple arrays and return an array
-       whose elements are each an array holding the elements of the input arrays of the same index (see example below).
+       where each element is an array containing the elements from the input arrays at the
+       same position of the internal array pointer (see example below).
        If only <parameter>array</parameter> is provided,
        <methodname>array_map</methodname> will return the input array.
       </para>