[libsigcplusplus] Correct some doxygen comments for variadic parameters.

[Murray Cumming <murrayc src gnome org>]

commit 2e2f9156668472a072fbabe8a5c607b0ec488a3f
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Apr 20 09:17:44 2016 +0200

    Correct some doxygen comments for variadic parameters.
    
    These showed up as errors in doxygen.log.

 sigc++/adaptors/adaptor_trait.h |    2 +-
 sigc++/adaptors/bind.h          |    2 +-
 sigc++/adaptors/bind_return.h   |    2 +-
 sigc++/adaptors/track_obj.h     |    2 +-
 sigc++/functors/mem_fun.h       |    4 ++--
 sigc++/functors/ptr_fun.h       |    3 +--
 6 files changed, 7 insertions(+), 8 deletions(-)
---
diff --git a/sigc++/adaptors/adaptor_trait.h b/sigc++/adaptors/adaptor_trait.h
index a5b4442..e585dd3 100644
--- a/sigc++/adaptors/adaptor_trait.h
+++ b/sigc++/adaptors/adaptor_trait.h
@@ -90,7 +90,7 @@ struct adaptor_functor : public adaptor_base
   decltype(auto) operator()() const { return functor_(); }
 
   /** Invokes the wrapped functor passing on the arguments.
-   * @param arg... Arguments to be passed on to the functor.
+   * @param arg Arguments to be passed on to the functor.
    * @return The return value of the functor invocation.
    */
   template <typename... T_arg>
diff --git a/sigc++/adaptors/bind.h b/sigc++/adaptors/bind.h
index 2accf27..8c4857c 100644
--- a/sigc++/adaptors/bind.h
+++ b/sigc++/adaptors/bind.h
@@ -271,7 +271,7 @@ struct visitor<bind_functor<-1, T_functor, T_type...>>
  * position of the argument to be fixed (@p -1 stands for the last argument).
  *
  * @param func Functor that should be wrapped.
- * @param b1 Argument to bind to @e func.
+ * @param b Arguments to bind to @e func.
  * @return Adaptor that executes @e func with the bound argument on invokation.
  *
  * @ingroup bind
diff --git a/sigc++/adaptors/bind_return.h b/sigc++/adaptors/bind_return.h
index ba6b101..44dcf96 100644
--- a/sigc++/adaptors/bind_return.h
+++ b/sigc++/adaptors/bind_return.h
@@ -43,7 +43,7 @@ struct bind_return_functor : public adapts<T_functor>
   typename unwrap_reference<T_return>::type operator()();
 
   /** Invokes the wrapped functor passing on the arguments.
-   * @param a... Arguments to be passed on to the functor.
+   * @param a Arguments to be passed on to the functor.
    * @return The fixed return value.
    */
   template <typename... T_arg>
diff --git a/sigc++/adaptors/track_obj.h b/sigc++/adaptors/track_obj.h
index 740a417..9256011 100644
--- a/sigc++/adaptors/track_obj.h
+++ b/sigc++/adaptors/track_obj.h
@@ -86,7 +86,7 @@ public:
   decltype(auto) operator()() { return this->functor_(); }
 
   /** Invokes the wrapped functor passing on the arguments.
-   * @param arg... Arguments to be passed on to the functor.
+   * @param arg Arguments to be passed on to the functor.
    * @return The return value of the functor invocation.
    */
   template <typename... T_arg>
diff --git a/sigc++/functors/mem_fun.h b/sigc++/functors/mem_fun.h
index 2408728..6808a39 100644
--- a/sigc++/functors/mem_fun.h
+++ b/sigc++/functors/mem_fun.h
@@ -108,7 +108,7 @@ public:
 
   /** Execute the wrapped method operating on the passed instance.
    * @param obj Reference to instance the method should operate on.
-   * @param a... Argument to be passed on to the method.
+   * @param a Arguments to be passed on to the method.
    * @return The return value of the method invocation.
    */
   decltype(auto) operator()(obj_type_with_modifier& obj, type_trait_take_t<T_arg>... a) const
@@ -147,7 +147,7 @@ public:
   }
 
   /** Execute the wrapped method operating on the stored instance.
-   * @param a... Argument to be passed on to the method.
+   * @param a Arguments to be passed on to the method.
    * @return The return value of the method invocation.
    */
   decltype(auto) operator()(type_trait_take_t<T_arg>... a) const
diff --git a/sigc++/functors/ptr_fun.h b/sigc++/functors/ptr_fun.h
index bfc137e..0bda77f 100644
--- a/sigc++/functors/ptr_fun.h
+++ b/sigc++/functors/ptr_fun.h
@@ -89,8 +89,7 @@ public:
   explicit pointer_functor(function_type func) : func_ptr_(func) {}
 
   /** Execute the wrapped function.
-   * @param a1 Argument to be passed on to the function.
-   * @param a2 Argument to be passed on to the function.
+   * @param a Arguments to be passed on to the function.
    * @return The return value of the function invocation.
    */
   T_return operator()(type_trait_take_t<T_args>... a) const { return func_ptr_(a...); }