QJsonArray::(const_)iterator: mark the pointer typedefs as internal

Just like the other typedefs; removes the doc warnings.

Change-Id: I61142b8db57f4e0cc44cb8c459b1e82e69da3413
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@theqtcompany.com>

src/corelib/json/qjsonarray.cpp

@@ -709,6 +709,11 @@ bool QJsonArray::operator!=(const QJsonArray &other) const
     \internal
 */
 
+/*! \typedef QJsonArray::iterator::pointer
+
+    \internal
+*/
+
 /*! \fn QJsonArray::iterator::iterator()
 
     Constructs an uninitialized iterator.
@@ -953,6 +958,11 @@ bool QJsonArray::operator!=(const QJsonArray &other) const
     \internal
 */
 
+/*! \typedef QJsonArray::const_iterator::pointer
+
+    \internal
+*/
+
 /*! \fn QJsonArray::const_iterator::const_iterator(const const_iterator &other)
 
     Constructs a copy of \a other.