WhatsNew.txt: Updated with SDL_WINDOW_FILL_DOCUMENT info.

Author: icculus

WhatsNew.txt

@@ -85,7 +85,7 @@ Linux:
 * Added SDL_PROP_DISPLAY_WAYLAND_WL_OUTPUT_POINTER so you can query the wl_output associated with a display
 
 Emscripten:
-* Added SDL_HINT_EMSCRIPTEN_FILL_DOCUMENT for applications that don't want to be fullscreen, but would like to fill the window
+* Added SDL_WINDOW_FILL_DOCUMENT flag for SDL_Windows to take up the whole browser window.
 * Added SDL_PROP_WINDOW_CREATE_EMSCRIPTEN_CANVAS_ID_STRING to allow setting the SDL canvas ID, and SDL_PROP_WINDOW_EMSCRIPTEN_CANVAS_ID_STRING to query it on existing windows
 * Added SDL_PROP_WINDOW_CREATE_EMSCRIPTEN_FILL_DOCUMENT_BOOLEAN to indicate that the window should fill the document, and SDL_PROP_WINDOW_EMSCRIPTEN_FILL_DOCUMENT_BOOLEAN to query it on existing windows
 * Added SDL_PROP_WINDOW_CREATE_EMSCRIPTEN_KEYBOARD_ELEMENT_STRING to specify where keyboard input is bound, and SDL_PROP_WINDOW_EMSCRIPTEN_KEYBOARD_ELEMENT_STRING to query it on existing windows