Documentation on enabling SDIO_SLAVE_FLAG_INTERNAL_PULLUP when using …

…internal pull-ups.

esp_hosted_fg/docs/Linux_based_host/SDIO_setup.md

@@ -56,6 +56,7 @@ One can load pre-built release binaries on ESP peripheral or compile those from
 ```sh
 $ cd esp_hosted_fg/esp/esp_driver/network_adapter
 ```
+- If you are using the ESP-WROVER-KIT and plan to use the internal pull-up resistors to quickly evaluate the driver, make sure to set the `SDIO_SLAVE_FLAG_INTERNAL_PULLUP` flag in the `sdio_slave_config_t config` of the `sdio_init` function. (However, the internal pullups are not sufficient and not reliable, please make sure external pullups are connected to the bus in your real design. For more information, check [SDIO pull-up requirements](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/sd_pullup_requirements.html).)
 
 ##### Using cmake
 * Execute following command to configure the project