Add since 5.4 markers

Change-Id: Ic0e594cb53016e6f68fbfb6e6064707344afefef
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

src/quick/scenegraph/util/qsgsimpletexturenode.cpp

@@ -260,6 +260,8 @@ QSGSimpleTextureNode::TextureCoordinatesTransformMode QSGSimpleTextureNode::text
     By default, the node does not take ownership of the texture.
 
     \sa setTexture()
+
+    \since 5.4
  */
 void QSGSimpleTextureNode::setOwnsTexture(bool owns)
 {
@@ -269,6 +271,8 @@ void QSGSimpleTextureNode::setOwnsTexture(bool owns)
 
 /*!
    Returns \c true if the node takes ownership of the texture; otherwise returns \c false.
+
+   \since 5.4
  */
 bool QSGSimpleTextureNode::ownsTexture() const
 {