wayland: Fix some comments

Fix grammar, and remove a TODO that is no longer relevant with an event thread.

src/video/wayland/SDL_waylandevents.c

@@ -499,9 +499,7 @@ void Wayland_SendWakeupEvent(SDL_VideoDevice *_this, SDL_Window *window)
 {
     SDL_VideoData *d = _this->internal;
 
-    /* Queue a sync event to unblock the event queue fd if it's empty and being waited on.
-     * TODO: Maybe use a pipe to avoid the compositor roundtrip?
-     */
+    // Queue a sync event to unblock the main event queue if it's being waited on.
     struct wl_callback *cb = wl_display_sync(d->display);
     wl_callback_add_listener(cb, &sync_listener, NULL);
     WAYLAND_wl_display_flush(d->display);

src/video/wayland/SDL_waylandkeyboard.c

@@ -186,7 +186,7 @@ bool Wayland_StartTextInput(SDL_VideoDevice *_this, SDL_Window *window, SDL_Prop
     }
 
     /* Always return true, even if the text input protocol isn't supported, as basic
-     * text can still be obtained from individual keys and composition system.
+     * text can still be obtained from keysyms and the composition system.
      */
     return true;
 }