Fix mandatory provider example in cookbook

RELNOTES: None
PiperOrigin-RevId: 155766583
diff --git a/site/versions/master/docs/skylark/cookbook.md b/site/versions/master/docs/skylark/cookbook.md
index 7793fe1..28303e2 100644
--- a/site/versions/master/docs/skylark/cookbook.md
+++ b/site/versions/master/docs/skylark/cookbook.md
@@ -680,7 +680,7 @@
   attrs={
       "number": attr.int(default=1),
       # All deps must provide all listed providers.
-      "deps": attr.label_list(providers=["number"]),
+      "deps": attr.label_list(providers=[NumberInfo]),
   },
   outputs = {"out": "%{name}.sum"}
 )