Update Exercises Directory Names to Reflect Order

exercises/10_modules/modules1.rs

@@ -0,0 +1,22 @@
+// modules1.rs
+//
+// Execute `rustlings hint modules1` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+mod sausage_factory {
+    // Don't let anybody outside of this module see this!
+    fn get_secret_recipe() -> String {
+        String::from("Ginger")
+    }
+
+    fn make_sausage() {
+        get_secret_recipe();
+        println!("sausage!");
+    }
+}
+
+fn main() {
+    sausage_factory::make_sausage();
+}