Fix Texinfo error in new snippet (issue 311530043 by address@hidden)

[david . nalesnik]

Reviewers: ,

Message:
Fix needed so that makelsr run will be successful.  Adding a snippet as
part of Issue 5029 depends on this fix.

Description:
Fix Texinfo error in new snippet

Correct error in snippet introduced in commit
5944d20489bb5b8e4c4907fa3b3bcae9ec275ccb.

Please review this at https://codereview.appspot.com/311530043/

Affected files (+1, -1 lines):
  M Documentation/snippets/new/using-marklines-in-a-frenched-score.ly


Index: Documentation/snippets/new/using-marklines-in-a-frenched-score.ly
diff --git  
a/Documentation/snippets/new/using-marklines-in-a-frenched-score.ly  
b/Documentation/snippets/new/using-marklines-in-a-frenched-score.ly
index  
0fdefc9138ed2358ea850805092e12dc7ea2ffda..2227e1cc244ffbf5ea90a82e67c9e4bd68028da9  
100644
--- a/Documentation/snippets/new/using-marklines-in-a-frenched-score.ly
+++ b/Documentation/snippets/new/using-marklines-in-a-frenched-score.ly
@@ -2,7 +2,7 @@
 \header {
   lsrtags = "contexts-and-engravers, staff-notation"
   texidoc = "
-Using @{MarkLine} contexts (such as in
+Using @code{MarkLine} contexts (such as in
 @uref{http://lsr.di.unimi.it/LSR/Item?id=1010, LSR1010}) in a
 Frenched score can be problematic if all the staves between two
 @code{MarkLine}s are removed in one system. The