docs: espsecure remote signing using a HSM broken link fix

docs/en/espsecure/index.rst

@@ -17,11 +17,7 @@ Remote Signing using an external HSM
 
 An external Hardware Security Module (HSM) can be used for remote signing of images in secure boot v2 scheme.
 
-You must install ``esptool.py`` package with the ``hsm`` extra using the command, ``pip install 'esptool[hsm]'`` to use this feature.
-
-``esp_hsm_sign`` provides a PKCS #11 interface to communicate with the external HSM and is integrated in ``espsecure.py``.
-
-Refer to `Signing using an External HSM <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/security/secure-boot-v2.html#signing-using-an-external-hsm>`_ to generate a Secure Boot V2 format unsigned firmware image.
+You must install ``esptool.py`` package with the ``hsm`` extra using the command ``pip install 'esptool[hsm]'`` to use this feature. ``esp_hsm_sign`` provides a PKCS #11 interface to communicate with the external HSM and is integrated in ``espsecure.py``.
 
 The following command should be used to get an image signed using an external HSM. ::
 
@@ -33,6 +29,9 @@ If the public key is not stored in the external HSM, you can specify the ``--pub
 
     python espsecure.py sign_data --version 2 --hsm --hsm-config <hsm_config_file> --pub-key <public_key> --output <signed_image> <datafile>
 
+.. note::
+    In case you are using ESP-IDF, then an unsigned application can be generated by disabling ``CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES`` configuration option in the project settings.
+
 Verifying the Signed Image
 ~~~~~~~~~~~~~~~~~~~~~~~~~~