Doc: Fix various documentation issues

- Document QIODeviceBase
- Document QPointerEvent::points
- Fix linking issues

Task-number: QTBUG-90662
Task-number: QTBUG-92273
Change-Id: Ib123d5708953b22e01f95c82626b39a49fff95b2
Reviewed-by: Nico Vertriest <nico.vertriest@qt.io>
(cherry picked from commit 00e10f62b55626097e94a2d70a9214c0062fbcd5)
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

examples/widgets/doc/src/addressbook-tutorial.qdoc

@@ -842,7 +842,7 @@
     If \c fileName is not empty, we create a QFile object, \c file, with
     \c fileName. QFile works with QDataStream as QFile is a QIODevice.
 
-    Next, we attempt to open the file in \l{QIODevice::}{WriteOnly} mode.
+    Next, we attempt to open the file in \l{QIODeviceBase::}{WriteOnly} mode.
     If this is unsuccessful, we display a QMessageBox to inform the user.
 
     \snippet tutorials/addressbook/part6/addressbook.cpp saveToFile() function part2
@@ -869,7 +869,7 @@
     \image addressbook-tutorial-part6-load.png
 
     If \c fileName is not empty, again, we use a QFile object, \c file, and
-    attempt to open it in \l{QIODevice::}{ReadOnly} mode. Similar to our
+    attempt to open it in \l{QIODeviceBase::}{ReadOnly} mode. Similar to our
     implementation of \c saveToFile(), if this attempt is unsuccessful, we
     display a QMessageBox to inform the user.
 
@@ -939,7 +939,7 @@
     choose a location for the file. Using the file name chosen, we create an
     instance of QFile to write to.
 
-    We attempt to open the file in \l{QIODevice::}{WriteOnly} mode. If this
+    We attempt to open the file in \l{QIODeviceBase::}{WriteOnly} mode. If this
     process fails, we display a QMessageBox to inform the user about the
     problem and return. Otherwise, we pass the file as a parameter to a
     QTextStream object, \c out. Like QDataStream, the QTextStream class

src/corelib/io/qiodevice.cpp

@@ -289,11 +289,19 @@ QIODevicePrivate::~QIODevicePrivate()
     \sa QBuffer, QFile, QTcpSocket
 */
 
+/*!
+    \class QIODeviceBase
+    \inheaderfile QIODevice
+    \inmodule QtCore
+    \brief Base class for QIODevice that provides flags describing the mode in
+           which a device is opened.
+*/
+
 /*!
     \enum QIODeviceBase::OpenModeFlag
 
-    This enum is used with open() to describe the mode in which a device
-    is opened. It is also returned by openMode().
+    This enum is used with QIODevice::open() to describe the mode in which a
+    device is opened. It is also returned by QIODevice::openMode().
 
     \value NotOpen   The device is not open.
     \value ReadOnly  The device is open for reading.

src/corelib/tools/qmargins.cpp

@@ -508,10 +508,9 @@ QDebug operator<<(QDebug dbg, const QMargins &m)
     Returns \c true if all margins are very close to 0; otherwise returns
     false.
 
-    \sa qFuzzyIsNull
+    \sa {<QtGlobal>::}{qFuzzyIsNull}
 */
 
-
 /*!
     \fn qreal QMarginsF::left() const
 

src/gui/image/qimagereader.cpp

@@ -769,7 +769,7 @@ bool QImageReader::decideFormatFromContent() const
     otherwise left unchanged.
 
     If the device is not already open, QImageReader will attempt to
-    open the device in \l QIODevice::ReadOnly mode by calling
+    open the device in \l {QIODeviceBase::}{ReadOnly} mode by calling
     open(). Note that this does not work for certain devices, such as
     QProcess, QTcpSocket and QUdpSocket, where more logic is required
     to open the device.
@@ -799,7 +799,7 @@ QIODevice *QImageReader::device() const
 /*!
     Sets the file name of QImageReader to \a fileName. Internally,
     QImageReader will create a QFile object and open it in \l
-    QIODevice::ReadOnly mode, and use this when reading images.
+    {QIODeviceBase::}{ReadOnly} mode, and use this when reading images.
 
     If \a fileName does not include a file extension (e.g., .png or .bmp),
     QImageReader will cycle through all supported extensions until it finds

src/gui/kernel/qevent.cpp

@@ -252,6 +252,12 @@ QInputEvent::~QInputEvent()
     Returns a QEventPoint reference for the point at index \a i.
 */
 
+/*!
+    \fn const QList<QEventPoint> &QPointerEvent::points() const
+
+    Returns a list of points in this pointer event.
+*/
+
 /*!
     \fn QPointingDevice::PointerType QPointerEvent::pointerType() const
 

src/gui/text/qtextdocumentwriter.cpp

@@ -182,7 +182,7 @@ QByteArray QTextDocumentWriter::format () const
     unchanged.
 
     If the device is not already open, QTextDocumentWriter will attempt to
-    open the device in \l QIODevice::WriteOnly mode by calling open().
+    open the device in \l {QIODeviceBase::}{WriteOnly} mode by calling open().
 
     \note This will not work for certain devices, such as QProcess,
     QTcpSocket and QUdpSocket, where some configuration is required before
@@ -211,7 +211,8 @@ QIODevice *QTextDocumentWriter::device () const
 /*!
     Sets the name of the file to be written to \a fileName. Internally,
     QTextDocumentWriter will create a QFile and open it in \l
-    QIODevice::WriteOnly mode, and use this file when writing the document.
+    {QIODeviceBase::}{WriteOnly} mode, and use this file when writing the
+    document.
 
     \sa fileName(), setDevice()
 */