Fix qdoc errors

Change-Id: I83f21bd6b780daa545c57d050d0f7562e8c0a4ff
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

examples/quickcontrols2/chattutorial/doc/src/qtquickcontrols2-chattutorial.qdoc

@@ -98,7 +98,7 @@ Let's modify the default QML code to suit our needs.
 
 \quotefromfile chattutorial/chapter1-settingup/main.qml
 \skipto import
-\printuntil import QtQuick.Controls 2.12
+\printuntil import QtQuick.Controls
 
 First, import the \l {Qt Quick} module. This gives us
 access to graphical primitives such as \l Item, \l Rectangle, \l Text, and so
@@ -667,8 +667,8 @@ changes to be done to \c ContactPage.qml. To be able to use the types,
 we must first import them using the URI we set in \c main.cpp:
 
 \quotefromfile chattutorial/chapter4-models/ContactPage.qml
-\skipto import io.qt.examples.chattutorial 1.0
-\printline import io.qt.examples.chattutorial 1.0
+\skipto import io.qt.examples.chattutorial
+\printline import io.qt.examples.chattutorial
 
 We then replace the dummy model with the proper one:
 

src/imports/controls/doc/src/qtquickcontrols2-customize.qdoc

@@ -711,8 +711,8 @@
         \image qtquickcontrols2-popup-custom.png
 
         \quotefromfile qtquickcontrols2-popup-custom.qml
-        \skipto import QtQuick 2.12
-        \printuntil import QtQuick.Controls 2.12
+        \skipto import QtQuick
+        \printuntil import QtQuick.Controls
         \codeline
         \skipto Popup
         \printuntil {

src/quicktemplates2/qquickcombobox.cpp

@@ -849,6 +849,8 @@ qreal QQuickComboBoxPrivate::calculateWidestTextWidth() const
 }
 
 /*!
+    \internal
+
     If the user requested it (and we haven't already done it, depending on the policy),
     update the implicit content width to the largest text in the model.
 */