Merge pull request #52713 from Calinou/x11-opengl-driver-reboot

Mention that rebooting is required after updating graphics driver on X11

platform/x11/os_x11.cpp

@@ -351,6 +351,7 @@ Error OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_a
 	if (gl_initialization_error) {
 		OS::get_singleton()->alert("Your video card driver does not support any of the supported OpenGL versions.\n"
 								   "Please update your drivers or if you have a very old or integrated GPU, upgrade it.\n"
+								   "If you have updated your graphics drivers recently, try rebooting.\n"
 								   "Alternatively, you can force software rendering by running Godot with the `LIBGL_ALWAYS_SOFTWARE=1`\n"
 								   "environment variable set, but this will be very slow.",
 				"Unable to initialize Video driver");