Merge pull request #476 from gypsydave5/ch09-02-fix-the-end

Fixes missing end to Ch09 02 on mdBook version

Author: carols10cents

src/ch09-02-recoverable-errors-with-result.md

@@ -435,7 +435,7 @@ we defined in Listing 9-5. The part of the `match` that requires a return type
 of `Result` is `return Err(e)`, so the return type of the function must be a
 `Result` to be compatible with this `return`.
 
-Let’s look at what happens if use `?` in the `main` function, which you’ll
+Let’s look at what happens if we use `?` in the `main` function, which you’ll
 recall has a return type of `()`:
 
 ```rust,ignore