That can't be it...

Author: iriark01

docs/reference/contributing/target/target.md

@@ -2,7 +2,7 @@
 
 Adding a new microcontroller to Arm Mbed OS 5 depends on CMSIS-CORE and CMSIS-Pack. Please make sure that the microcontroller already has these available.
 
-#### Adding a new microcontroller and board
+### Adding a new microcontroller and board
 
 First fork the `mbed-os` repository on GitHub into your own user account. We will use the placeholder `USERNAME` to refer to your username in the following documentation, `MCU_NAME` to refer to the new microcontroller you are adding and `BOARD_NAME` to refer to the new board you are adding. Import an Mbed OS example, and add your fork of `mbed-os` using:
 
@@ -17,7 +17,7 @@ git branch my-new-target -u USERNAME
 cd ..
 ```
 
-#### Target description
+### Target description
 
 Add the target description to `mbed-os\targets\targets.json` using keys that the [Adding and configuring targets section](/docs/development/tools/adding-and-configuring-targets.html) describes. We recommend that you run the [targets lint script](/docs/development/tools/adding-and-configuring-targets.html#style-guide) on your target hierarchy before submitting your pull request:
 
@@ -34,7 +34,7 @@ Add the target description to `mbed-os\targets\targets.json` using keys that the
 }
 ```
 
-#### HAL porting
+### HAL porting
 
 There are many more APIs to implement. You enable the following APIs by adding a `device_has` attribute to the MCU_NAME target definition in `targets.json` and providing an implementation of the API declared in the API header.