platform/DRMFormat: Point people at the GitHub new issue page for rep…

…orting missing formats

src/platform/graphics/drm_formats.cpp

@@ -490,7 +490,8 @@ auto mg::DRMFormat::info() const -> std::optional<Info const>
     auto unknown_formats = unknown_formats_guard.lock();
     if (!unknown_formats->contains(fourcc))
     {
-        mir::log_warning("Detailed info for format %s missing; please report so this can be added", name());
+        mir::log_warning(
+            "Detailed info for format %s missing; please report this to https://github.com/canonical/mir/issues/new so this can be added", name());
         unknown_formats->insert(fourcc);
     }
     return std::nullopt;