Update xml/issue4402.xml

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

Author: tomaszkam

xml/issue4402.xml

@@ -74,7 +74,7 @@ and <tt>basic_mask</tt> objects.
 <p>
 This is NAD as user cannot rely on standard types not being constructible per
 <sref ref="[member.functions]"/> p2. The example would not be fixed by adding
-the <tt>explict</tt> in conforming implementation, and changes in <tt>return</tt>
+the <tt>explicit</tt> in a conforming implementation, and changes in <tt>return</tt>
 specification are editorial.
 </p>
 </discussion>