Doc: Removed pages from the "qml-features" group.

-This group is from Qt 4 and no longer relevant in Qt 5.
-The \group page in qtdoc is removed.

Change-Id: I6349a9056ae45c98b31c70fd693adecf71e2ba8c
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Geir Vattekar <geir.vattekar@digia.com>

src/qml/doc/src/qmllanguageref/syntax/signals.qdoc

@@ -27,7 +27,6 @@
 
 /*!
 \page qtqml-syntax-signals.html
-\ingroup qml-features
 
 \title Signal and Handler Event System
 \brief the event sytem in QML
@@ -294,4 +293,3 @@ output:
 
 
 */
-

src/quick/doc/src/concepts/effects/sprites.qdoc

@@ -27,7 +27,6 @@
 
 /*!
 \ingroup qtquick-images-sprites
-\ingroup qml-features
 \page qtquick-effects-sprites.html
 \title Sprite Animations
 \brief Sprite-based animations with flexible transitioning

src/quick/doc/src/concepts/input/focus.qdoc

@@ -27,7 +27,6 @@
 
 /*!
 \page qtquick-input-focus.html
-\ingroup qml-features
 \title Keyboard Focus in Qt Quick
 \brief handling keyboard focus
 

src/quick/doc/src/concepts/positioning/layouts.qdoc

@@ -28,7 +28,6 @@
 /*!
 \ingroup qtquick-positioners
 \page qtquick-positioning-layouts.html
-\ingroup qml-features
 \title Item Layouts
 
 Positioner items are container items that manage the positions and sizes of

src/quick/doc/src/concepts/positioning/righttoleft.qdoc

@@ -27,7 +27,6 @@
 
 /*!
 \page qtquick-positioning-righttoleft.html
-\ingroup qml-features
 \title Right-to-left User Interfaces
 \brief switching text flow and layout
 \section1 Overview