Platform: fix Doxygen warnings.

src/Magnum/Platform/AbstractXApplication.h

@@ -115,7 +115,11 @@ class AbstractXApplication {
 
         /** @{ @name Screen handling */
 
-        /** @copydoc Sdl2Application::swapBuffers() */
+        /**
+         * @brief Swap buffers
+         *
+         * Paints currently rendered framebuffer on screen.
+         */
         void swapBuffers();
 
         /** @copydoc Sdl2Application::redraw() */

src/Magnum/Platform/AndroidApplication.h

@@ -239,7 +239,11 @@ class AndroidApplication {
 
         /** @{ @name Screen handling */
 
-        /** @copydoc Sdl2Application::swapBuffers() */
+        /**
+         * @brief Swap buffers
+         *
+         * Paints currently rendered framebuffer on screen.
+         */
         void swapBuffers();
 
         /** @copydoc Sdl2Application::redraw() */

src/Magnum/Platform/GlutApplication.h

@@ -161,7 +161,11 @@ class GlutApplication {
 
         /** @{ @name Screen handling */
 
-        /** @copydoc Sdl2Application::swapBuffers() */
+        /**
+         * @brief Swap buffers
+         *
+         * Paints currently rendered framebuffer on screen.
+         */
         void swapBuffers() { glutSwapBuffers(); }
 
         /** @copydoc Sdl2Application::redraw() */

src/Magnum/Platform/NaClApplication.h

@@ -266,7 +266,11 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
         bool setFullscreen(bool enabled);
 
     protected:
-        /** @copydoc Sdl2Application::swapBuffers() */
+        /**
+         * @brief Swap buffers
+         *
+         * Paints currently rendered framebuffer on screen.
+         */
         void swapBuffers();
 
         /** @copydoc Sdl2Application::redraw() */