MAINTAINERS: Update drm-misc web page

This URL gets redirected to the Intel landing page now. Let's switch the
webpage to freedesktop.

Link: https://lore.kernel.org/r/20240306153841.698693-2-mripard@kernel.orgAcked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <mripard@kernel.org>

MAINTAINERS

@@ -7021,7 +7021,7 @@ M:	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
 M:	Maxime Ripard <mripard@kernel.org>
 M:	Thomas Zimmermann <tzimmermann@suse.de>
 S:	Maintained
-W:	https://01.org/linuxgraphics/gfx-docs/maintainer-tools/drm-misc.html
+W:	https://drm.pages.freedesktop.org/maintainer-tools/drm-misc.html
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
 F:	Documentation/devicetree/bindings/display/
 F:	Documentation/devicetree/bindings/gpu/