driver/gpio: fix interrupt type names in comment block

https://github.com/espressif/esp-idf/issues/56

components/driver/include/driver/gpio.h

@@ -313,7 +313,7 @@ esp_err_t gpio_set_pull_mode(gpio_num_t gpio_num, gpio_pull_mode_t pull);
   *
   * @param gpio_num GPIO number.
   *
-  * @param intr_type GPIO wake-up type. Only GPIO_INTR_LOLEVEL\GPIO_INTR_HILEVEL can be used
+  * @param intr_type GPIO wake-up type. Only GPIO_INTR_LOW_LEVEL\GPIO_INTR_HIGH_LEVEL can be used.
   *
   * @return
   *     - ESP_OK Success