[gtk+] infobar: Fix typo

[Timm Bäder <baedert src gnome org>]

commit af49609b8f88f7802b8c32fe1a57c3397cf36b37
Author: Timm Bäder <mail baedert org>
Date:   Mon May 2 08:59:40 2016 +0200

    infobar: Fix typo
    
    Style class names are prefixed with a '.'

 gtk/gtkinfobar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkinfobar.c b/gtk/gtkinfobar.c
index e2c64fb..507fb0c 100644
--- a/gtk/gtkinfobar.c
+++ b/gtk/gtkinfobar.c
@@ -124,7 +124,7 @@
  * # CSS nodes
  *
  * GtkInfoBar has a single CSS node with name infobar. The node may get
- * one of the style classes .info, warning, .error or .question, depending
+ * one of the style classes .info, .warning, .error or .question, depending
  * on the message type.
  */