Add API version info; fix references to protocol version.

src/wayland/plasmawindowmanagement_interface.cpp

@@ -105,7 +105,7 @@ private:
     static const struct org_kde_plasma_window_interface s_interface;
 };
 
-const quint32 PlasmaWindowManagementInterface::Private::s_version = 2;
+const quint32 PlasmaWindowManagementInterface::Private::s_version = 3;
 
 PlasmaWindowManagementInterface::Private::Private(PlasmaWindowManagementInterface *q, Display *d)
     : Global::Private(d, &org_kde_plasma_window_management_interface, s_version)

src/wayland/plasmawindowmanagement_interface.h

@@ -119,7 +119,13 @@ Q_SIGNALS:
     void fullscreenableRequested(bool set);
     void skipTaskbarRequested(bool set);
     QRect minimizedGeometriesChanged();
+    /**
+     * @since 5.7
+     */
     void shadableRequested(bool set);
+    /**
+     * @since 5.7
+     */
     void shadedRequested(bool set);
 
 private: