Merge branch '714-update-guide-to-firmware-partitions' into 'master'

## Ensuring all firmware partitions are consistent

In some cases slot `b` can be unpopulated or contain much older firmware than slot `a`, leading to various issues including a potential hard-brick. We can ensure none of that will happen by copying the contents of slot `a` to slot `b`. 

{% include alerts/tip.html content="The steps below only need to be run once per device." %}

This step is `mandatory`.

In some cases, the inactive slot can be unpopulated or contain much older firmware than the active slot, leading to various issues including a potential hard-brick. We can ensure none of that will happen by copying the contents of the active slot to the inactive slot.

To do this, sideload the `copy-partitions-20210323_1922.zip` package by doing the following:

1. Download the `copy-partitions-20210323_1922.zip` file from [here](https://www.androidfilehost.com/?fid=2188818919693768129).

{% if device.uses_twrp %}

2. Sideload the `copy-partitions-20210323_1922.zip` package:

    * On the device, select "Advanced", "ADB Sideload", then swipe to begin sideload

    * On the host machine, sideload the package using: `adb sideload copy-partitions-20210323_1922.zip`

{% else %}

2. Sideload the `copy-partitions-20210323_1922.zip` package:

    * On the device, select "Apply Update", then "Apply from ADB" to begin sideload.

    * On the host machine, sideload the package using: `adb sideload copy-partitions-20210323_1922.zip`

{% include alerts/warning.html content="The Recovery  will present a screen that says `Signature verification failed`, this is expected, please click `Continue`." %}

{% endif %}

To do this, sideload the `copy-partitions-20220613-signed.zip` package by doing the following:

 1. Download the `copy-partitions-20220613-signed.zip` file from [here](https://mirrorbits.lineageos.org/tools/copy-partitions-20220613-signed.zip). It should have a MD5 sum of `79f2f860830f023b7030c29bfbea7737` or a SHA-256 sum of `92f03b54dc029e9ca2d68858c14b649974838d73fdb006f9a07a503f2eddd2cd`.

{%- if device.uses_twrp %}

 2. Sideload the `copy-partitions-20220613-signed.zip` package:

    * On the device, select `Advanced`, `ADB Sideload`, then swipe to begin sideload

    * On the host machine, sideload the package using: `adb sideload copy-partitions-20220613-signed.zip`

{%- else %}

  2. Sideload the `copy-partitions-20220613-signed.zip` package:

    * On the device, select `Apply Update`, then `Apply from ADB` to begin sideload.

    * On the host machine, sideload the package using: `adb sideload copy-partitions-20220613-signed.zip`

  3. Now reboot to recovery by tapping `Advanced`, then `Reboot to recovery`.

{%- endif %}