Update doc/specs/stdlib_hashmaps.md

Co-authored-by: Jeremie Vandenplas <[email protected]>

Author: wclodius2

doc/specs/stdlib_hashmaps.md

@@ -2011,7 +2011,7 @@ Pure function
 ##### Argument
 
 `map` (pass): shall be a scalar expression of class
-`chaining_hashmap_type`. It is an `intent(in)` argument. It is the
+`hashmap_type`. It is an `intent(in)` argument. It is the
 hash map of interest.
 
 ##### Result character