Fix a few qdoc warnings

src/quick3d/doc/quick3d.qdocconf

@@ -6,17 +6,17 @@ version                 = $QT_VERSION
 
 examplesinstallpath     = quick3d
 
-# Custom module header that pulls in also QtQuickWidgets
+# Custom module header that pulls in also QtQuick3D
 moduleheader            = QtQuick3DDoc
 includepaths            = -I .
 
 qhp.projects            = QtQuick3D
 
-qhp.QtQuick.file                = qtquick3d.qhp
-qhp.QtQuick.namespace           = org.qt-project.qtquick3d.$QT_VERSION_TAG
-qhp.QtQuick.virtualFolder       = qtquick3d
-qhp.QtQuick.indexTitle          = Qt Quick 3D
-qhp.QtQuick.indexRoot           =
+qhp.QtQuick3D.file                = qtquick3d.qhp
+qhp.QtQuick3D.namespace           = org.qt-project.qtquick3d.$QT_VERSION_TAG
+qhp.QtQuick3D.virtualFolder       = qtquick3d
+qhp.QtQuick3D.indexTitle          = Qt Quick 3D
+qhp.QtQuick3D.indexRoot           =
 
 qhp.QtQuick3D.filterAttributes    = qtquick3d $QT_VERSION qtrefdoc
 qhp.QtQuick3D.customFilters.Qt.name = QtQuick3D $QT_VERSION
@@ -39,7 +39,8 @@ tagfile                 = ../../../doc/qtquick3d/qtquick3d.tags
 
 depends += qtqml qtquick qtdoc
 
-headerdirs  += ..
+headerdirs  += .. \
+               ..\..
 
 sourcedirs  += .. \
                src  
@@ -56,4 +57,4 @@ sourcedirs += ../../imports
 headerdirs += ../../plugins
 sourcedirs += ../../plugins
 
-navigation.landingpage = "Qt Quick 3D"
\ No newline at end of file
+navigation.landingpage = "Qt Quick 3D"

src/quick3d/doc/src/qtquick3d-index.qdoc

@@ -10,7 +10,7 @@ Qt Quick scenegraph for spatial content, and a renderer for that extended
 scenegraph. When using the Spatial scenegraph it is also be possible to mix
 Qt Quick 2D content with 3D content.
 
-\image demoRender.png
+\image demonRender.png
 
 \section1 Related information
 

src/quick3d/doc/src/qtquick3d-module.qdoc

 /*!
 \module QtQuick3D
 \title Qt Quick 3D C++ Classes
-\brief Provides the necessary C++ classes to include 3D items.
+\brief Provides the necessary C++ classes to include 3D items
 
 \omit
 TODO: Add necessary information to use the module.

src/quick3d/doc/src/qtquick3d-qmlmodule.qdoc

 /*!
 \qmlmodule QtDemon 1.0
 \title Qt Quick 3D QML Types
-\brief Provides the QML types to include 3D items.
+\brief Provides the QML types to include 3D items
 
 This is the QML frontend for using the spatial renderer and scenegraph. For the
 time being, all 3D content goes through offscreen textures (FBO)s so that they