Update documentation of creating Music and Cursor

doc/mainpage.hpp

@@ -29,9 +29,7 @@
 ///     sf::Text text(font, "Hello SFML", 50);
 ///
 ///     // Load a music to play
-///     sf::Music music;
+///     auto music = sf::Music::openFromFile("nice_music.ogg").value();
-///     if (!music.openFromFile("nice_music.ogg"))
-///         return EXIT_FAILURE;
 ///
 ///     // Play the music
 ///     music.play();

include/SFML/Audio/Music.hpp

@@ -299,14 +299,8 @@ private:
 ///
 /// Usage example:
 /// \code
-/// // Declare a new music
+/// // Open a music from an audio file
-/// sf::Music music;
+/// auto music = sf::Music::openFromFile("music.ogg").value();
-///
-/// // Open it from an audio file
-/// if (!music.openFromFile("music.ogg"))
-/// {
-///     // error...
-/// }
 ///
 /// // Change some parameters
 /// music.setPosition(0, 1, 10); // change its 3D position

include/SFML/Window/Cursor.hpp

@@ -245,9 +245,8 @@ private:
 ///
 /// // ... create window as usual ...
 ///
-/// sf::Cursor cursor;
+/// const auto cursor = sf::Cursor::loadFromSystem(sf::Cursor::Type::Hand).value();
-/// if (cursor.loadFromSystem(sf::Cursor::Type::Hand))
+/// window.setMouseCursor(cursor);
-///     window.setMouseCursor(cursor);
 /// \endcode
 ///
 /// \see sf::WindowBase::setMouseCursor