[libsigcplusplus] docs: Use signal<R(Args..)> syntax.

[Murray Cumming <murrayc src gnome org>]

commit 14dd14106e668d986bec5c61a8c1c1efcec7391d
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Mar 16 10:52:02 2016 +0100

    docs: Use signal<R(Args..)> syntax.

 sigc++/adaptors/bind.h      |    6 +++---
 sigc++/adaptors/compose.h   |    2 +-
 sigc++/adaptors/hide.h      |    2 +-
 sigc++/adaptors/retype.h    |    2 +-
 sigc++/adaptors/track_obj.h |    2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/sigc++/adaptors/bind.h b/sigc++/adaptors/bind.h
index c3b9050..459b884 100644
--- a/sigc++/adaptors/bind.h
+++ b/sigc++/adaptors/bind.h
@@ -38,7 +38,7 @@ namespace sigc {
  *
  * @par Example:
  * @code
- * sigc::signal<void> some_signal;
+ * sigc::signal<void()> some_signal;
  * void foo(int);
  * some_signal.connect(sigc::bind(&foo,1));
  * @endcode
@@ -58,7 +58,7 @@ namespace sigc {
  * @par Example:
  * @code
  * int some_int;
- * sigc::signal<void> some_signal;
+ * sigc::signal<void()> some_signal;
  * void foo(int&);
  * some_signal.connect(sigc::bind(&foo, std::ref(some_int)));
  * @endcode
@@ -70,7 +70,7 @@ namespace sigc {
  * @par Example:
  * @code
  * struct bar : public sigc::trackable {} some_bar;
- * sigc::signal<void> some_signal;
+ * sigc::signal<void()> some_signal;
  * void foo(bar&);
  * some_signal.connect(sigc::bind(&foo, std::ref(some_bar)));
  *   // disconnected automatically if some_bar goes out of scope
diff --git a/sigc++/adaptors/compose.h b/sigc++/adaptors/compose.h
index 57fe15e..adfc8f5 100644
--- a/sigc++/adaptors/compose.h
+++ b/sigc++/adaptors/compose.h
@@ -22,7 +22,7 @@ namespace sigc {
  *
  * @par Example:
  * @code
- * sigc::signal<float,float,float> some_signal;
+ * sigc::signal(float(float, float)> some_signal;
  * some_signal.connect(sigc::compose(&square_root, &sum));
  * @endcode
  *
diff --git a/sigc++/adaptors/hide.h b/sigc++/adaptors/hide.h
index 0d98dd3..6717aa4 100644
--- a/sigc++/adaptors/hide.h
+++ b/sigc++/adaptors/hide.h
@@ -35,7 +35,7 @@ namespace sigc {
  *
  * @par Example:
  * @code
- * sigc::signal<void,int> some_signal;
+ * sigc::signal<void(int)> some_signal;
  * void foo();
  * some_signal.connect(sigc::hide(&foo));
  * @endcode
diff --git a/sigc++/adaptors/retype.h b/sigc++/adaptors/retype.h
index f3fc538..4c4e2fb 100644
--- a/sigc++/adaptors/retype.h
+++ b/sigc++/adaptors/retype.h
@@ -25,7 +25,7 @@ namespace sigc {
  *
  * @par Example:
  * @code
- * sigc::signal<void,float> some_signal;
+ * sigc::signal<void(float)> some_signal;
  * void foo(int);
  * some_signal.connect(sigc::retype(sigc::ptr_fun(&foo)));
  * @endcode
diff --git a/sigc++/adaptors/track_obj.h b/sigc++/adaptors/track_obj.h
index 039dd27..69a5c9b 100644
--- a/sigc++/adaptors/track_obj.h
+++ b/sigc++/adaptors/track_obj.h
@@ -20,7 +20,7 @@ namespace sigc {
  * @par Example:
  * @code
  * struct bar : public sigc::trackable {};
- * sigc::signal<void> some_signal;
+ * sigc::signal<void()> some_signal;
  * void foo(bar&);
  * {
  *   bar some_bar;