heap: Added note to increase INT_WDT timeout for integrity-check APIs

- When PSRAM is enabled, the heap integrity check APIs
  (`heap_caps_check_integrity` and `heap_caps_check_integrity_all`)
  take more time to execute and keep the interrupts disabled for a
  longer time.

components/heap/include/esp_heap_caps.h

@@ -252,6 +252,9 @@ void heap_caps_print_heap_info( uint32_t caps );
  *
  * @param print_errors Print specific errors if heap corruption is found.
  *
+ * @note Please increase the value of `CONFIG_ESP_INT_WDT_TIMEOUT_MS` when using this API
+ * with PSRAM enabled.
+ *
  * @return True if all heaps are valid, False if at least one heap is corrupt.
  */
 bool heap_caps_check_integrity_all(bool print_errors);
@@ -270,6 +273,9 @@ bool heap_caps_check_integrity_all(bool print_errors);
  *                    of memory
  * @param print_errors Print specific errors if heap corruption is found.
  *
+ * @note Please increase the value of `CONFIG_ESP_INT_WDT_TIMEOUT_MS` when using this API
+ * with PSRAM capability flag.
+ *
  * @return True if all heaps are valid, False if at least one heap is corrupt.
  */
 bool heap_caps_check_integrity(uint32_t caps, bool print_errors);