Doc: Fix documentation warnings related to Clang QDoc parser

Since Qt 5.11, QDoc uses Clang to parse C++ documentation. Clang
requires a module header, as well as proper include paths, to
build a precompiled header and process the sources.

To do this, add a custom module header that pulls in all Qt 3D modules
- this way, we can continue using a single documentation project to
covers all of Qt 3D.

Fix all documentation warnings are caused by missing namespaces, QML
module/type names and typos, as well as a number of linking problems
and other minor issues.

After this change, the remaining documentation issues consist of
'No documentation for ...' warnings.

Task-number: QTBUG-67790
Change-Id: I38b91163c475a00cc1893e793240470c5409eb57
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc/src/qt3d-index.qdoc b/src/doc/src/qt3d-index.qdoc
index 0e889e652..eaeaf789e 100644
--- a/src/doc/src/qt3d-index.qdoc
+++ b/src/doc/src/qt3d-index.qdoc
@@ -68,7 +68,7 @@
 
     For a C++ application that performs 2D or 3D rendering, collision
     detection, and also handle user input, add the following line to its
-    \l qmake \c .pro file:
+    qmake \c .pro file:
 
     \badcode
     QT += 3dcore 3drender 3dinput 3dlogic 3dextras 3danimation