Apply suggestions from code review

Co-authored-by: Sebastian Romero <s.romero.zh@gmail.com>

Author: umbynos

content/hardware/04.pro/boards/portenta-h7/tutorials/secure-boot/secure-boot.md

@@ -18,7 +18,7 @@ This short tutorial will guide the user through enabling the secure boot on the
 ## Hardware & Software Required
 -   [Portenta H7](https://store.arduino.cc/portenta-h7)
 -   Arduino IDE 1.8.19+  or Arduino IDE 2.0.0-rc5+ (https://www.arduino.cc/en/software)
--   [Arduino Mbed OS Portenta Boards](https://github.com/arduino/ArduinoCore-mbed) version 3.0.0+
+-   [Arduino Core for mbed enabled devices](https://github.com/arduino/ArduinoCore-mbed) version 3.0.0+
 -   [imgtool](https://github.com/arduino/imgtool-packing/releases/latest) (optional)
 
 ## Instructions
@@ -32,9 +32,9 @@ Once The bootloader has been updated to MCUboot, it's possible to use [secure bo
 If no operation is performed the default security keys are used.
 These keys are embedded in the example sketch `STM32H747_updateBootloader` which can be found in  **Files > Examples > STM32H747_System > STM32H747_updateBootloader**. A private 256bit [ECDSA](https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm) key is used for the encryption (`ecdsa-p256-encrypt-key.h`), while a public key is used for the signing (`ecdsa-p256-signing-key.h`). These two keys are the ones the bootloader uses to verify if a sketch is valid or not, before starting it for the first time. The default private keys used after compiling a sketch to sign and encrypt it are located in `Arduino15/packages/arduino/hardware/mbed_portenta/<version>/libraries/MCUboot/default_keys/`.
 
-### 1. Generate Custom Cecurity Keys
+### 1. Generate Custom Security Keys
 The default keys provided with the mbed platform are obviously only intended for development purposes. In a production environment it is strongly recommended to generate a new key pair (public and private key).
-This can be done with [**imgtool**](https://github.com/arduino/imgtool-packing/releases/latest). You can download and install it directly from the release section.
+This can be done with **imgtool**. You can download and install it directly from the [release section](https://github.com/arduino/imgtool-packing/releases/latest).
 
 ***`imgtool` is already installed by the mbed platform and can be found in the `%LOCALAPPDATA%\Arduino15\packages\arduino\tools\imgtool` directory on Windows, in `~/.arduino15/packages/arduino/tools/imgtool` on Linux and in `~/Library/Arduino15/packages/arduino/tools/imgtool` on macOS.***
 
@@ -45,10 +45,10 @@ imgtool keygen --key my-encrypt-keyfile.pem -t ecdsa-p256
 ```
 This command line will generate two private PEM encoded security keys and save them in the current directory with `my-sign-keyfile.pem` and `my-encrypt-keyfile.pem` names. The algorithm used to generate the keys is ECDSA 256bit.
 
-Remember to **save the keys on a secure location** and not to lose them.
+Remember to **save the keys and keep them in a secure location** and not to lose them.
 
 ### 2. Upload the Custom Keys to the Board
-Once the keys have been generated they have to be uploaded on the Portenta. This procedure has to be done only once, because it's persistent. To extract the public\private key and encode it in to a "C" byte array inside a `.h` header file you can use:
+Once the keys have been generated they have to be uploaded to the Portenta H7. This procedure has to be done only once, because it's persistent. To extract the public\private key and encode it in to a "C" byte array inside a `.h` header file you can use:
 ```
 imgtool getpriv -k my-encrypt-keyfile.pem > ecsda-p256-encrypt-key.h 
 imgtool getpub -k my-sign-keyfile.pem > ecsda-p256-signing-key.h
@@ -68,4 +68,4 @@ arduino-cli compile -b arduino:mbed_portenta:envie_m7 --board-options security=s
 ```
 
 ## Learn More
-If you want to implement secure boot for your platform [this](https://arduino.github.io/arduino-cli/latest/guides/secure-boot/) should be helpful.
+If you want to implement secure boot for your platform have a look at [this article] (https://arduino.github.io/arduino-cli/latest/guides/secure-boot/).