path-clarity: Fix visibility bug

Author: joshtriplett

src/2018/transitioning/modules/path-clarity.md

@@ -108,7 +108,7 @@ extern crate futures;
 use futures::Future;
 
 mod foo {
-    struct Bar;
+    pub struct Bar;
 }
 
 use foo::Bar;
@@ -139,7 +139,7 @@ crate` line:
 use futures::Future;
 
 mod foo {
-    struct Bar;
+    pub struct Bar;
 }
 
 use foo::Bar;
@@ -171,7 +171,7 @@ mod submodule {
     use futures::Future;
 
     mod foo {
-        struct Bar;
+        pub struct Bar;
     }
 
     use foo::Bar;
@@ -223,7 +223,7 @@ extern crate futures;
 use futures::Future;
 
 mod foo {
-    struct Bar;
+    pub struct Bar;
 }
 
 use foo::Bar;
@@ -238,7 +238,7 @@ Now looks like this:
 use futures::Future;
 
 mod foo {
-    struct Bar;
+    pub struct Bar;
 }
 
 // 'crate' means the current crate