doc fix for lily/stem-engraver.cc (issue 198820043 by address@hidden)

[david . nalesnik]

Reviewers: ,

Message:
Please review.

Description:
doc fix for lily/stem-engraver.cc

This engraver also creates Flag and StemStub grobs.

Please review this at https://codereview.appspot.com/198820043/

Affected files (+3, -1 lines):
  M lily/stem-engraver.cc


Index: lily/stem-engraver.cc
diff --git a/lily/stem-engraver.cc b/lily/stem-engraver.cc
index  
62c0974f9f3a04627b807c70f0d76581fadcfb14..45c777fb04091e61574ba5ccd444cea96c1c658b  
100644
--- a/lily/stem-engraver.cc
+++ b/lily/stem-engraver.cc
@@ -236,11 +236,13 @@ ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);

 ADD_TRANSLATOR (Stem_engraver,
                 /* doc */
-                "Create stems and single-stem tremolos.  It also works"
+                "Create stems, flags and single-stem tremolos.  It also  
works"
                 " together with the beam engraver for overriding beaming.",

                 /* create */
+                "Flag "
                 "Stem "
+                "StemStub "
                 "StemTremolo ",

                 /* read */