[libsigcplusplus] slot: Correct the doxygen comment line ending.

[Murray Cumming <murrayc src gnome org>]

commit c6da73f08de0dda45dac51c7493890bae48a589b
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Mar 11 10:17:28 2016 +0100

    slot: Correct the doxygen comment line ending.

 sigc++/functors/slot.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/sigc++/functors/slot.h b/sigc++/functors/slot.h
index ad23ab1..3ada878 100644
--- a/sigc++/functors/slot.h
+++ b/sigc++/functors/slot.h
@@ -133,7 +133,8 @@ struct slot_call
  * a single, arbitrary functor (or closure) that is executed in operator()().
  *
  * The template arguments determine the function signature of operator()():
- * - @e T_return The return type of operator()(). * - @e T_arg Argument types used in the definition of 
operator()().
+ * - @e T_return The return type of operator()().
+ * - @e T_arg Argument types used in the definition of operator()().
  *
  * To use simply assign the desired functor to the slot. If the functor
  * is not compatible with the parameter list defined with the template