Update xml/issue3959.xml

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

Author: tomaszkam

xml/issue3959.xml

@@ -31,8 +31,8 @@ Should we make the constructor take a <tt>const</tt> reference?
 Set priority to 3 after reflector poll.
 </p>
 <p>
-We should provide a blanket wording to specify that comperators,
-hasher, allocators, etc. can be copied as often or as little as
+We should provide blanket wording to specify that comparators,
+hashers, allocators, etc. can be copied as often or as little as
 needed. Consider generalizing <iref ref="3049"/>.
 </p>
 </discussion>