[docs] Remove references to C++11 feature availability

QVersionNumber, e.g., was added for Qt 5.6, the last Qt version that
didn't require C++11. So it made sense that the original documentation
stated that certain functions were only available in C++11 mode.

But already Qt 5.7 required C++11, so these historical anecdotes are
no longer pertient to today's Qt users, so remove them from the docs.

Pick-to: 6.5 6.2 5.15
Change-Id: I5c732d3b9b33e1fb6947eff4fac546476c8379f2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 4f3142bfce0c64d023299f142d14e60ec577b698)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 5b856ba18f0316e9886a0d1048c9e1bb5e2b9fa1)

src/corelib/global/qendian.cpp

@@ -445,8 +445,8 @@ QT_BEGIN_NAMESPACE
     The template parameter \c T must be a C++ integer type:
     \list
        \li 8-bit: char, signed char, unsigned char, qint8, quint8
-       \li 16-bit: short, unsigned short, qint16, quint16, char16_t (C++11)
-       \li 32-bit: int, unsigned int, qint32, quint32, char32_t (C++11)
+       \li 16-bit: short, unsigned short, qint16, quint16, char16_t
+       \li 32-bit: int, unsigned int, qint32, quint32, char32_t
        \li 64-bit: long long, unsigned long long, qint64, quint64
        \li platform-specific size: long, unsigned long
        \li pointer size: qintptr, quintptr, qptrdiff

src/corelib/thread/qatomic.cpp

@@ -32,8 +32,8 @@
     The template parameter \c T must be a C++ integer type:
     \list
        \li 8-bit: bool, char, signed char, unsigned char, qint8, quint8, char8_t (C++20)
-       \li 16-bit: short, unsigned short, qint16, quint16, char16_t (C++11)
-       \li 32-bit: int, unsigned int, qint32, quint32, char32_t (C++11)
+       \li 16-bit: short, unsigned short, qint16, quint16, char16_t
+       \li 32-bit: int, unsigned int, qint32, quint32, char32_t
        \li 64-bit: long long, unsigned long long, qint64, quint64
        \li platform-specific size: long, unsigned long
        \li pointer size: qintptr, quintptr, qptrdiff

src/corelib/tools/qcommandlineoption.cpp

@@ -116,8 +116,7 @@ QCommandLineOption::QCommandLineOption(const QStringList &names)
     The default value for the option is set to \a defaultValue.
 
     In Qt versions before 5.4, this constructor was \c explicit. In Qt 5.4
-    and later, it no longer is and can be used for C++11-style uniform
-    initialization:
+    and later, it no longer is and can be used for uniform initialization:
 
     \snippet code/src_corelib_tools_qcommandlineoption.cpp cxx11-init
 
@@ -152,8 +151,7 @@ QCommandLineOption::QCommandLineOption(const QString &name, const QString &descr
     The default value for the option is set to \a defaultValue.
 
     In Qt versions before 5.4, this constructor was \c explicit. In Qt 5.4
-    and later, it no longer is and can be used for C++11-style uniform
-    initialization:
+    and later, it no longer is and can be used for uniform initialization:
 
     \snippet code/src_corelib_tools_qcommandlineoption.cpp cxx11-init-list
 

src/corelib/tools/qhash.cpp

@@ -2937,9 +2937,6 @@ size_t qHash(long double key, size_t seed) noexcept
 
     Constructs a multi-hash with a copy of each of the elements in the
     initializer list \a list.
-
-    This function is only available if the program is being
-    compiled in C++11 mode.
 */
 
 /*! \fn template <class Key, class T> QMultiHash<Key, T>::QMultiHash(const QHash<Key, T> &other)

src/corelib/tools/qsharedpointer.cpp

@@ -174,7 +174,7 @@
     last QSharedPointer instance had.
 
     This class is never instantiated directly: the constructors and
-    destructor are private and, in C++11, deleted. Only the create() function
+    destructor are deleted. Only the create() function
     may be called to return an object of this type. See below for construction
     details.
 
@@ -213,8 +213,7 @@
 
     Like ExternalRefCountWithCustomDeleter, this class is never instantiated
     directly. This class also provides a create() member that returns the
-    pointer, and hides its constructors and destructor. With C++11, they're
-    deleted.
+    pointer, and deletes its constructors and destructor.
 
     The size of this class depends on the size of \tt T.
 

src/corelib/tools/qvarlengtharray.qdoc

@@ -98,9 +98,6 @@
     \since 5.5
 
     Constructs an array from the std::initializer_list given by \a args.
-
-    This constructor is only enabled if the compiler supports C++11 initializer
-    lists.
 */
 
 /*! \fn template<class T, qsizetype Prealloc> template<typename InputIterator, if_input_iterator<InputIterator>> QVarLengthArray<T, Prealloc>::QVarLengthArray(InputIterator first, InputIterator last)
@@ -424,9 +421,6 @@
     \since 5.5
 
     Assigns the values of \a list to this array, and returns a reference to this array.
-
-    This constructor is only enabled if the compiler supports C++11 initializer
-    lists.
 */
 
 /*! \fn template<class T, qsizetype Prealloc> QVarLengthArray<T, Prealloc>::QVarLengthArray(const QVarLengthArray<T, Prealloc> &other)

src/corelib/tools/qversionnumber.cpp

@@ -72,8 +72,6 @@ QT_IMPL_METATYPE_EXTERN(QTypeRevision)
     \fn QVersionNumber::QVersionNumber(QList<int> &&seg)
 
     Move-constructs a version number from the list of numbers contained in \a seg.
-
-    This constructor is only enabled if the compiler supports C++11 move semantics.
 */
 
 /*!
@@ -81,9 +79,6 @@ QT_IMPL_METATYPE_EXTERN(QTypeRevision)
 
     Construct a version number from the std::initializer_list specified by
     \a args.
-
-    This constructor is only enabled if the compiler supports C++11 initializer
-    lists.
 */
 
 /*!

src/gui/painting/qregion.cpp

@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
     contains() a QPoint or QRect. The bounding rectangle can be found
     with boundingRect().
 
-    Iteration over the region (with begin(), end(), or C++11
+    Iteration over the region (with begin(), end(), or
     ranged-for loops) gives a decomposition of the region into
     rectangles.