Update request-handling.mdx

Fix typo

Author: kathayl

src/content/docs/ai-gateway/configuration/request-handling.mdx

@@ -22,7 +22,7 @@ Request timeouts can be set on a Universal Endpoint or directly on a request to
 
 ### Definitions
 
-A timeout is set in milliseconds. Additionaly, the timeout is based on when the first part of the response comes back. As long as the first part of the response returns within the specified timeframe - such as when streaming a response - your gateway will wait for the response.
+A timeout is set in milliseconds. Additionally, the timeout is based on when the first part of the response comes back. As long as the first part of the response returns within the specified timeframe - such as when streaming a response - your gateway will wait for the response.
 
 ### Configuration