[libsigcplusplus] docs: ptr_fun: Improve the simple description.

[Murray Cumming <murrayc src gnome org>]

commit b2ade6255ba9e8153a4475031f1ca8ea9ee1e9f7
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 1 12:09:11 2016 +0200

    docs: ptr_fun: Improve the simple description.

 sigc++/functors/ptr_fun.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/sigc++/functors/ptr_fun.h b/sigc++/functors/ptr_fun.h
index ef4b36a..ec8e120 100644
--- a/sigc++/functors/ptr_fun.h
+++ b/sigc++/functors/ptr_fun.h
@@ -6,7 +6,7 @@ namespace sigc
 {
 
 /** @defgroup ptr_fun ptr_fun()
- * ptr_fun() is used to convert a pointer to a function to a functor.
+ * ptr_fun() creates a functor from a pointer to a function.
  * If the function pointer is to an overloaded type, you must specify
  * the types using template arguments starting with the first argument.
  * It is not necessary to supply the return type.