Update doc/specs/stdlib_hash_procedures.md

Co-authored-by: Ivan Pribec <ivan.pribec@gmail.com>

Author: jvdp1

doc/specs/stdlib_hash_procedures.md

@@ -1512,8 +1512,8 @@ Function
 ##### Arguments
 
 `key`: shall be a scalar of type default character expression or a
-Rank 1 integer vector expression of kind `INt8`, `INT16`, `INT32`, or
-`INTT64`. It is an `intent(in)` argument.
+Rank 1 integer vector expression of kind `INT8`, `INT16`, `INT32`, or
+`INT64`. It is an `intent(in)` argument.
 
 `seed`: shall be a two element integer vector expression of kind
 `INT64`. It is an `intent(in)` argument.