[LyX/master] Revert doc update for Additional.lyx so maitenance work can continue.

[Pavel Sanda]

On Fri, Dec 30, 2022 at 09:27:32AM +0100, Jürgen Spitzmüller wrote:
> Am Donnerstag, dem 29.12.2022 um 15:25 -0500 schrieb Scott Kostyshak:
> > Sounds good. I can do that. Should I do that now or wait (i.e., would
> > this change disrupt the ongoing work)?
> 
> It's probably better to wait until John is done.

Scott, this is the right time for your fix...

Pavel