Fix wrong remarks for forward_list::emplace_front

Author: Rageking8

docs/standard-library/forward-list-class.md

@@ -350,7 +350,7 @@ The element added to the beginning of the forward list.
 
 ### Remarks
 
-This member function inserts an element with the constructor arguments `_ val` at the end of the controlled sequence.
+This member function inserts an element with the constructor arguments `val` at the beginning of the controlled sequence.
 
 If an exception is thrown, the container is left unaltered and the exception is rethrown.