Resolve "Update for FP3 install guide"

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<div class="alert alert-danger">

    <div class="d-inline ml-1" markdown="span"><b class="mr-3">Caution:</b> {{include.content}}</div>

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{% include alerts/danger.html content="Please note this build is for the original FP3 under Android 9 (Pie) only. 

The FP3+ and its new camera modules are not supported on /e/OS yet. If you have upgraded your FP3 to the new Android 10 stock OS please do not flash this build." %}               

## Unlock the bootloader

-  Allow the bootloader unlocking by following the [official FP3 unlock documentation](https://www.fairphone.com/en/bootloader-unlocking-code-for-fairphone-3/) 

    Fastboot flash boot_b boot.img

    ```

{% include alerts/tip.html content= "If you find an issue with this installation document or if you want to suggest improvements, Please create a dedicated thread on our  [community forum](https://community.e.foundation/) "%}