[LyX/master] DocBook: improve doc for MathML prefix.

[Thibaut Cuvelier]

commit 950a53db3bb11658d372369b800ca1ce3a784932
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Wed Mar 24 22:14:51 2021 +0100

    DocBook: improve doc for MathML prefix.
---
 lib/doc/Additional.lyx |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/lib/doc/Additional.lyx b/lib/doc/Additional.lyx
index db98f25..d6c91e5 100644
--- a/lib/doc/Additional.lyx
+++ b/lib/doc/Additional.lyx
@@ -6122,7 +6122,7 @@ m:math
 
 \begin_layout Itemize
 
-\change_inserted 1075283030 1616535102
+\change_inserted 1075283030 1616620405
 With the 
 \family typewriter
 mml
@@ -6134,6 +6134,14 @@ m
  option, but with 
 \family typewriter
 mml
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1075283030 1616620470
+This option is especially useful if you want \SpecialChar LyX
+ to match your personal style
+ or to work with buggy software that only accepts one prefix for MathML.
 \change_unchanged
 
 \end_layout