Fix a few typos

Also make the response for an invalid JSON request body a 400 instead of
a 200 HTTP status code.

Author: DSpeckhals

src/controllers/user/me.rs

@@ -246,7 +246,7 @@ pub fn update_email_notifications(req: &mut dyn Request) -> CargoResult<Response
     let mut body = String::new();
     req.body().read_to_string(&mut body)?;
     let updates: HashMap<i32, bool> = serde_json::from_str::<Vec<CrateEmailNotifications>>(&body)
-        .map_err(|_| human("invalid json request"))?
+        .map_err(|_| bad_request("invalid json request"))?
         .iter()
         .map(|c| (c.id, c.email_notifications))
         .collect();

src/tests/user.rs

@@ -592,7 +592,7 @@ fn test_existing_user_email() {
 }
 
 /* A user should be able to update the email notifications for crates they own. Only the crates that
-   were sent in the request should be updated the the corresponding `email_notifications` value.
+   were sent in the request should be updated to the corresponding `email_notifications` value.
 */
 #[test]
 fn test_update_email_notifications() {
@@ -678,7 +678,7 @@ fn test_update_email_notifications() {
 }
 
 /* A user should not be able to update the `email_notifications` value for a crate that is not
-   owend by them.
+   owned by them.
 */
 #[test]
 fn test_update_email_notifications_not_owned() {