[LyX/master] Additional.lyx: rm English variant switches

[Scott Kostyshak]

commit 3c8a5d4dad07911c7d74a3909efde25dc9137b45
Author: Scott Kostyshak <skostysh at lyx.org>
Date:   Wed Jan 4 21:50:39 2023 -0500

    Additional.lyx: rm English variant switches
    
    Use the following command to automate the process:
    
      sed -i "/^\\\lang \(american\|british\)$/d" Additional.lyx
    
    The next commit will just resave the file with LyX, so as to clean
    up the file contents after the external command from this commit.

 lib/doc/Additional.lyx |  523 ------------------------------------------------
 1 files changed, 0 insertions(+), 523 deletions(-)