doc: Update drm-tip URL
With the drm-tip migration to Gitlab, all the URLs have changed so reflect that in the doc.
Signed-off-by: Maxime Ripard mripard@kernel.org
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With the drm-tip migration to Gitlab, all the URLs have changed so reflect that in the doc.
Signed-off-by: Maxime Ripard mripard@kernel.org