QSharedPointer: fix docs for create()

In 5.12 only the variadic argument version is left (as all
supported compilers have variadic templates). Remove the docs
of the nullary overload, and fix the docs for the remaining
overload.

Change-Id: I54cc7ea71cc61ba1330a9ad92e4fa2ae7f749bac
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qsharedpointer.cpp

@@ -649,19 +649,7 @@
 */
 
 /*!
-    \fn template <class T> QSharedPointer<T> QSharedPointer<T>::create()
-    \since 5.1
-
-    Creates a QSharedPointer object and allocates a new item of type \tt T. The
-    QSharedPointer internals and the object are allocated in one single memory
-    allocation, which could help reduce memory fragmentation in a long-running
-    application.
-
-    This function calls the default constructor for type \tt T.
-*/
-
-/*!
-    \fn template <class T> QSharedPointer<T> QSharedPointer<T>::create(...)
+    \fn template <class T> template <typename... Args> QSharedPointer<T> QSharedPointer<T>::create(Args &&... args)
     \overload
     \since 5.1
 
@@ -671,18 +659,7 @@
     application.
 
     This function will attempt to call a constructor for type \tt T that can
-    accept all the arguments passed. Arguments will be perfectly-forwarded.
-
-    \note This function is only fully available with a C++11 compiler that
-    supports perfect forwarding of an arbitrary number of arguments.
-
-    If the compiler does not support the necessary C++11 features,
-    then a restricted version is available since Qt 5.4: you may pass
-    one (but just one) argument, and it will always be passed by const
-    reference.
-
-    If you target Qt before version 5.4, you must use the overload
-    that calls the default constructor.
+    accept all the arguments passed (\a args). Arguments will be perfectly-forwarded.
 */
 
 /*!

src/corelib/tools/qsharedpointer.h

@@ -97,8 +97,8 @@ public:
     template <class X> QSharedPointer<X> constCast() const;
     template <class X> QSharedPointer<X> objectCast() const;
 
-    static inline QSharedPointer<T> create();
-    static inline QSharedPointer<T> create(...);
+    template <typename... Args>
+    static inline QSharedPointer<T> create(Args &&... args);
 };
 
 template <class T>