doc: fix a typo in ccl.h(#2993)

Fixed "Cicular" -> "Circular"

Co-authored-by: realstealthninja <[email protected]>

Author: 9santa

data_structures/cll/cll.h

@@ -1,5 +1,5 @@
 /*
- * Simple data structure CLL (Cicular Linear Linked List)
+ * Simple data structure CLL (Circular Linear Linked List)
  * */
 #include <cctype>
 #include <cstdlib>