Finish the Lilac->Maple upgrade instructions

[kdmccormick]

Here: https://github.com/openedx/edx-documentation/blob/master/en_us/install_operations/source/platform_releases/maple.rst

fyi @nedbat @regisb

[BbrSofiane]

@kdmccormick is someone assigned to this task?

[kdmccormick]

@BbrSofiane No, nobody is.

[NeOneSoft]

Hi @BbrSofiane !!!! I think that we still need to assign this issue!!

[arbrandes]

Closing as stale.