Update 11.4.md

fix some type error

C11-Hash-Tables/11.4.md

@@ -45,7 +45,7 @@ Write pseudocode for HASH-DELETE as outlined in the text, and modify HASH-INSERT
 			j = h(k, i)
 			if T[j] == NIL or T[j] == DELETED
 				T[j] = k
-				rteurn j
+				return j
 			else i = i + 1
 		until i == m
 		error "hash table overflow"