[gnome-shell] st: Fix doc comment

[Florian Müllner <fmuellner src gnome org>]

commit 6b3c9539f6d08526e9d1ca1fa41a16675572b22a
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed May 24 11:10:01 2017 +0200

    st: Fix doc comment
    
    The trailing colon breaks recent versions of gtk-doc, so drop it.

 src/st/st-shadow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/st/st-shadow.c b/src/st/st-shadow.c
index dbd3f8e..73aa1a3 100644
--- a/src/st/st-shadow.c
+++ b/src/st/st-shadow.c
@@ -180,7 +180,7 @@ st_shadow_get_box (StShadow              *shadow,
 }
 
 /**
- * SECTION:st-shadow-helper:
+ * SECTION: st-shadow-helper
  *
  * An helper for implementing a drop shadow on a actor.
  * The actor is expected to recreate the helper whenever its contents