Add @code{} to middleCOffset (issue 10566043)

[thomasmorley65]

Reviewers: ,

Message:
Please review.

Description:
Add @code{} to middleCOffset

Wraps middleCOffset from doc-string of "ly:set-middle-C!"
(pitch-scheme.cc) into @code{}

Fix issue 3424

Please review this at https://codereview.appspot.com/10566043/

Affected files:
  M lily/pitch-scheme.cc


Index: lily/pitch-scheme.cc
diff --git a/lily/pitch-scheme.cc b/lily/pitch-scheme.cc
index  
0433325523d9c9dbf4e20c9993fed55ee6308043..238d235e72652853f0dda3850f05c37edef062a6  
100644
--- a/lily/pitch-scheme.cc
+++ b/lily/pitch-scheme.cc
@@ -172,7 +172,7 @@ LY_DEFINE (ly_set_middle_C_x, "ly:set-middle-C!",
            1, 0, 0, (SCM context),
            "Set the @code{middleCPosition} variable in @var{context}"
            " based on the variables @code{middleCClefPosition} and"
-           " middleCOffset.")
+           " @code{middleCOffset}.")
 {
   LY_ASSERT_SMOB (Context, context, 1);