FIX: comment rework

main.c

@@ -54,9 +54,11 @@ len_loop                    // do {
  *      We use a simple O(n), no stack algorithm.
  * @note
  *      This function also writes to RAM address @ref RESULT the return value (which is nasty).
- * @arg     R0: Pointer to string
- * @return  R0: True if predicate
- *              False if not
+ * @arg     src{R0}     Pointer to string
+ * @return  {R0}        True if palindrome, false if not or src is NULL pointer
+ * @note
+ *      We consider an empty string "" to be a palindrome, as we can see it the same way both
+ *      from the front and the back.
  */
 __asm uint32_t isPalindrome (const char* src) {
     // R0: src[]