exp 14: correct wrong algorithm name

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

14.c

@@ -1,4 +1,3 @@
-#include <math.h>
 #include <stdio.h>
 
 void shell_sort(int arr[], int n) {
@@ -22,7 +21,7 @@ int main() {
   const int SIZE = 5;
 
   int arr[] = {93, 110, 12398, -5, 2};
-  printf("Insertion Sort on: ");
+  printf("Shell Sort on: ");
   display(arr, SIZE);
   shell_sort(arr, SIZE);
   display(arr, SIZE);