[LyX/master] Fix FORMAT documentation

[Juergen Spitzmueller]

commit 86693b5c3c8726bfce3b7b488300179fee4cab4f
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Fri Mar 13 15:51:41 2020 +0100

    Fix FORMAT documentation
---
 development/FORMAT |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/development/FORMAT b/development/FORMAT
index 75b5190..f903ed3 100644
--- a/development/FORMAT
+++ b/development/FORMAT
@@ -10,7 +10,7 @@ changes happened in particular if possible. A good example would be
 2020-03-13 Jürgen Spitzmüller <spitz at lyx.org>
  	* Format incremented to 593: Buffer param \maintain_unincluded_children is not longer a bool
           (true|false) but has three states: "no" (formerly "false"), "strict" (formerly "true") and
-          "once" (a new intermediate state).
+          "mostly" (a new intermediate state).
 
 2020-01-11 Jürgen Spitzmüller <spitz at lyx.org>
  	* Format incremented to 592: Add tabular column/row tag changed="[added|deleted] id time"