Update exercises/practice/rate-limiter/.docs/instructions.md

Co-authored-by: Kah Goh <[email protected]>

Author: andreatanky

exercises/practice/rate-limiter/.docs/instructions.md

@@ -15,7 +15,8 @@ Once the window resets, the allowance refreshes for the next window.
 Each client is tracked separately, so another client can make requests within that same period.
 
 For example, consider a rate limiter configured to limit 2 requests per 10 seconds per client.
-Lets say client A sends a request. 
+Lets say a client sends a request: 
+
 - Being its first request, the request is permitted.
 - A second request within 10 seconds after the first one is also permitted.
 - However, further requests after that would be denied _until_ at least 10 seconds has elapsed since the first request.