Platform: improve docs of MAGNUM_*APPLICATION_MAIN() for consistency.

src/Magnum/Platform/Sdl2Application.h

@@ -1601,8 +1601,9 @@ class Sdl2Application::TextEditingEvent {
 
 See @ref Magnum::Platform::Sdl2Application "Platform::Sdl2Application" for
 usage information. This macro abstracts out platform-specific entry point code
-and is equivalent to the following, see @ref portability-applications for more
-information.
+and is equivalent to the following on all supported platforms except
+@ref CORRADE_TARGET_WINDOWS_RT "Windows RT", see @ref portability-applications
+for more information.
 @code
 int main(int argc, char** argv) {
     className app({argc, argv});

src/Magnum/Platform/WindowlessEglApplication.h

@@ -331,9 +331,16 @@ class WindowlessEglApplication {
 
 See @ref Magnum::Platform::WindowlessEglApplication "Platform::WindowlessEglApplication"
 for usage information. This macro abstracts out platform-specific entry point
-code, see @ref portability-applications for more information. When no other
-windowless application header is included this macro is also aliased to
-`MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
+code and is equivalent to the following, see @ref portability-applications for
+more information.
+@code
+int main(int argc, char** argv) {
+    className app({argc, argv});
+    return app.exec();
+}
+@endcode
+When no other windowless application header is included this macro is also
+aliased to `MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
 */
 #define MAGNUM_WINDOWLESSEGLAPPLICATION_MAIN(className)                     \
     int main(int argc, char** argv) {                                       \

src/Magnum/Platform/WindowlessIosApplication.h

@@ -289,9 +289,16 @@ class WindowlessIosApplication {
 
 See @ref Magnum::Platform::WindowlessIosApplication "Platform::WindowlessIosApplication"
 for usage information. This macro abstracts out platform-specific entry point
-code, see @ref portability-applications for more information. When no other
-windowless application header is included this macro is also aliased to
-`MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
+code and is equivalent to the following, see @ref portability-applications for
+more information.
+@code
+int main(int argc, char** argv) {
+    className app({argc, argv});
+    return app.exec();
+}
+@endcode
+When no other windowless application header is included this macro is also
+aliased to `MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
 */
 #define MAGNUM_WINDOWLESSIOSAPPLICATION_MAIN(className)                     \
     int main(int argc, char** argv) {                                       \

src/Magnum/Platform/WindowlessWglApplication.h

@@ -343,9 +343,16 @@ class WindowlessWglApplication {
 
 See @ref Magnum::Platform::WindowlessWglApplication "Platform::WindowlessWglApplication"
 for usage information. This macro abstracts out platform-specific entry point
-code, see @ref portability-applications for more information. When no other
-windowless application header is included this macro is also aliased to
-`MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
+code and is equivalent to the following, see @ref portability-applications for
+more information.
+@code
+int main(int argc, char** argv) {
+    className app({argc, argv});
+    return app.exec();
+}
+@endcode
+When no other windowless application header is included this macro is also
+aliased to `MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
 */
 #define MAGNUM_WINDOWLESSWGLAPPLICATION_MAIN(className)                     \
     int main(int argc, char** argv) {                                       \

src/Magnum/Platform/WindowlessWindowsEglApplication.h

@@ -327,10 +327,17 @@ class WindowlessWindowsEglApplication {
 @param className Class name
 
 See @ref Magnum::Platform::WindowlessWindowsEglApplication "Platform::WindowlessWindowsEglApplication"
-for usage information. This macro abstracts out platform-specific entry point
-code, see @ref portability-applications for more information. When no other
-windowless application header is included this macro is also aliased to
-`MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
+for usage information.This macro abstracts out platform-specific entry point
+code and is equivalent to the following, see @ref portability-applications for
+more information.
+@code
+int main(int argc, char** argv) {
+    className app({argc, argv});
+    return app.exec();
+}
+@endcode
+When no other windowless application header is included this macro is also
+aliased to `MAGNUM_WINDOWLESSAPPLICATION_MAIN()`.
 */
 #define MAGNUM_WINDOWLESSWINDOWSEGLAPPLICATION_MAIN(className)              \
     int main(int argc, char** argv) {                                       \