Fix minor issues in FP3 documentation

## Installing /e/OS from the bootloader

{% include alerts/tip.html content="For Windows users, we advise to use Git Bash. For more info about Downloads and Installation see https://git-scm.com/about"%}

{% include alerts/tip.html content="For Windows users, we advise to use Git Bash. For more info about Downloads and Installation see [Official Documentation](https://git-scm.com/about)"%}

1. Unzip the archive

    - Power OFF the device and press `Volume Down + Power` buttons simultaneously.

1. Run the installer script on terminal(Linux) or on Git Bash UI(Windows).

1. Run the installer script on Terminal(Linux) or on Git Bash UI(Windows).

1. Make sure you are in the current directory which contains the `flash_FP3_factory.sh` file.

    Linux

    - Right click -> Open terminal here

    Windows

    - Right click -> Git Bash here