emerald: update fastboot commands

```

fastboot erase userdata

fastboot erase metadata

fastboot flash gz_a gz.img

fastboot flash lk_a lk.img

fastboot flash md1img_a md1img.img

fastboot flash scp_a scp.img

fastboot flash spmfw_a spmfw.img

fastboot flash sspm_a sspm.img

fastboot flash tee_a tee.img

fastboot format md_udc

fastboot flash boot_a boot.img

fastboot flash dtbo_a dtbo.img

fastboot flash vbmeta_a vbmeta.img

fastboot flash vbmeta_system_a vbmeta_system.img

fastboot flash vbmeta_vendor_a vbmeta_vendor.img

fastboot flash super super.img

fastboot flash lk_a lk.img

fastboot flash logo logo-verified.bin

fastboot flash preloader_a preloader_yk673v6_lwg62_64.bin

fastboot --set-active=a

fastboot -w reboot

fastboot reboot

```

{% include alerts/tip.html content="If your device is not detect by fastboot, try to use `sudo fastboot` instead"%}

## Locking the Bootloader

 Once you have completed the above steps  and before rebooting you can and should lock your Bootloader. 

1. Boot your device into bootloader if not already there, and plug it to your computer

1. Lock the device with the following command

   - `fastboot flashing lock`

   - Approve with  <kbd>Voume +</kbd>

1. Reboot with `fastboot reboot`

{% include alerts/success.html content= "Congratulations !! Your phone should now be booting into /e/OS !! "%}