Update xml/issue4405.xml

Co-authored-by: Jonathan Wakely <[email protected]>

Author: tomaszkam

xml/issue4405.xml

@@ -38,7 +38,7 @@ arithmetic for `mdspan`.
 Set priority to 3 after reflector poll.
 </p>
 <p>
-Even if `data_handle_type` is a pointer to `value_type`, thids does not mean
+Even if `data_handle_type` is a pointer to `value_type`, this does not mean
 that it points to contiguous range of `value_type` objects. Accessor may
 provide different access parttern.
 </p>