modify comments on esp_tls_cfg, to clarify that other formats besides PEM (such as DER) might be used as well depending on mbedtls-support
modify comments on esp_tls_cfg, to clarify that other formats besides PEM (such as DER) might be used as well depending on mbedtls-support

Signed-off-by: David Cermak <916dbddb07caf9b553e556b695943389e496f9ce@espressif.com>

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf