[libsigcplusplus] docs: slots: Fix tiny typo.

[Murray Cumming <murrayc src gnome org>]

commit 91df733156350b9cdf7df8dc8aa144e147ce1ffe
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 12:07:06 2016 +0200

    docs: slots: Fix tiny typo.

 sigc++/functors/slot_base.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/sigc++/functors/slot_base.h b/sigc++/functors/slot_base.h
index 562005b..353ec57 100644
--- a/sigc++/functors/slot_base.h
+++ b/sigc++/functors/slot_base.h
@@ -218,7 +218,7 @@ struct SIGC_API slot_do_unbind
  *
  * You can also pass slots as method parameters where you might normally pass a function pointer.
  *
- * @section slots-auto-disconnect Member Methods and Automatic Disconnection.
+ * @section slots-auto-disconnect Member Methods and Automatic Disconnection
  *
  * See @ref mem_fun "sigc::mem_fun()" about deriving from sigc::trackable to prevent member
  * methods from being called after the instance has been destroyed.