Update info.toml

modules2.rs: add more information to hint

Author: deedy5

info.toml

@@ -478,7 +478,8 @@ hint = """
 The delicious_snacks module is trying to present an external interface that is
 different than its internal structure (the `fruits` and `veggies` modules and
 associated constants). Complete the `use` statements to fit the uses in main and
-find the one keyword missing for both constants."""
+find the one keyword missing for both constants.
+Learn more at https://doc.rust-lang.org/book/ch07-04-bringing-paths-into-scope-with-the-use-keyword.html#re-exporting-names-with-pub-use"""
 
 [[exercises]]
 name = "modules3"