Doc: do not break the values list by blank lines in qnamespace.qdoc

There should be no blank lines in \value content, otherwise qdoc
ends the list and starts a new one.

Change-Id: Idddc7992317894487445aea36397136df40b9691
Reviewed-by: Martin Smith <martin.smith@qt.io>

src/corelib/global/qnamespace.qdoc

@@ -123,16 +123,14 @@
     \value AA_PluginApplication Indicates that Qt is used to author a plugin. Depending
            on the operating system, it suppresses specific initializations that do not
            necessarily make sense in the plugin case.
-
            For example on OS X, this includes avoiding loading our nib for the main
            menu and not taking possession of the native menu bar. Setting this
            attribute to true will also set the AA_DontUseNativeMenuBar attribute
            to true. It also disables native event filters.
-
            This attribute has been added in Qt 5.7. It must be set before
            \l {QGuiApplication}{Q(Gui)Application} is constructed.
 
-     \value AA_MacPluginApplication This attribute has been deprecated.
+    \value AA_MacPluginApplication This attribute has been deprecated.
            Use AA_PluginApplication instead.
 
     \value AA_DontUseNativeMenuBar All menubars created while this attribute is
@@ -166,7 +164,6 @@
     \value AA_UseHighDpiPixmaps Make QIcon::pixmap() generate high-dpi pixmaps
            that can be larger than the requested size. Such pixmaps will have
            \l {QPixmap::devicePixelRatio}{devicePixelRatio()} set to a value higher than 1.
-
            After setting this attribute, application code that uses pixmap
            sizes in layout geometry calculations should typically divide by
            \l {QPixmap::devicePixelRatio}{devicePixelRatio()} to get device-independent layout geometry.