[LyX/master] fix copy-paste error

[Georg Baum]

commit e4c3a329e45b32b92d55a85e4305f1333a6121ab
Author: Georg Baum <b...@lyx.org>
Date:   Thu Oct 31 21:45:51 2013 +0100

    fix copy-paste error

diff --git a/lib/doc/LaTeXConfig.lyx b/lib/doc/LaTeXConfig.lyx
index 73979e5..a856894 100644
--- a/lib/doc/LaTeXConfig.lyx
+++ b/lib/doc/LaTeXConfig.lyx
@@ -6840,7 +6840,7 @@ mathtools
 Found: 
 \begin_inset Info
 type  "package"
-arg   "mathdots"
+arg   "mathtools"
 \end_inset