docs: more doxygen fixes (#2736)

src/platform/linux/graphics.cpp

@@ -339,6 +339,9 @@ namespace egl {
     return eglGetError() != EGL_SUCCESS;
   }
 
+  /**
+   * @memberof egl::display_t
+   */
   display_t
   make_display(std::variant<gbm::gbm_t::pointer, wl_display *, _XDisplay *> native_display) {
     constexpr auto EGL_PLATFORM_GBM_MESA = 0x31D7;

src/platform/linux/wayland.h

@@ -17,7 +17,7 @@
  * The classes defined in this macro block should only be used by
  * cpp files whose compilation depends on SUNSHINE_BUILD_WAYLAND
  */
-#ifdef SUNSHINE_BUILD_WAYLAND
+#if defined(SUNSHINE_BUILD_WAYLAND) || defined(DOXYGEN)
 
 namespace wl {
   using display_internal_t = util::safe_ptr<wl_display, wl_display_disconnect>;