Apply suggestions from code review

Co-authored-by: Colton Beach <98902851+cbeac243@users.noreply.github.com>

Author: alisaduncan

_source/_posts/2024-03-03-stepup-authentication.md

@@ -330,7 +330,7 @@ export const stepupInterceptor: HttpInterceptorFn = (req, next) => {
 };
 ```
 
-The error handler needs first to verify this is an error we want to handle. Is this HTTP error a step-up error from our resource server? We can check for this! In the `handleError` method, add the following code and change the return value.
+The error handler needs first to verify this is an error we want to handle. Is this HTTP error a step-up error from our resource server? We can check for this! In the `handleError` method, add the following code and change the return value:
 
 ```ts
 const handleError = (httpError: HttpErrorResponse) => {