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>

2 files changed, 3 insertions, 3 deletions

diff --git a/src/core/nodes/qnode.cpp b/src/core/nodes/qnode.cpp
index ecdc83b2c..b370102d4 100644
--- a/src/core/nodes/qnode.cpp
+++ b/src/core/nodes/qnode.cpp
@@ -984,9 +984,9 @@ QNodeCommand::CommandId QNode::sendCommand(const QString &name,
 }
 
 /*!
- * \brief Send a command back to the backend node
+ * \brief Send a \a command back to the backend node.
  *
- * Assumes the command is to be to sent back in reply to itself to the backend node
+ * Assumes the command is to be to sent back in reply to itself to the backend node.
  *
  * \sa QNodeCommand, QNode::sendCommand
  */
diff --git a/src/core/nodes/qnodeid.cpp b/src/core/nodes/qnodeid.cpp
index 7e392137e..3e11733e6 100644
--- a/src/core/nodes/qnodeid.cpp
+++ b/src/core/nodes/qnodeid.cpp
@@ -89,7 +89,7 @@ namespace Qt3DCore {
 
 /*!
  * \fn Qt3DCore::QNodeId::operator bool() const
- * \TODO
+ * Returns \TODO
  */
 
 /*!