Merge branch 'docs/add_note_for_esp32_sec_dl_mode' into 'master'

bootloader: add note about secure download mode for ESP32 target

Closes IDFGH-5857

See merge request espressif/esp-idf!15304

components/bootloader/Kconfig.projbuild

@@ -893,6 +893,8 @@ menu "Security features"
                 It is also possible to enable secure download mode at runtime by calling
                 esp_efuse_enable_rom_secure_download_mode()
 
+                Note: Secure Download mode is not available for ESP32 (includes revisions till ECO3).
+
         config SECURE_INSECURE_ALLOW_DL_MODE
             bool "UART ROM download mode (Enabled (not recommended))"
             help