Update src/guides/v2.4/graphql/caching.md

Co-authored-by: Kevin Harper <keharper@users.noreply.github.com>

Author: nuzil

src/guides/v2.4/graphql/caching.md

@@ -116,7 +116,7 @@ if (req.request == "GET" && req.url.path ~ "/graphql" && req.url.qs ~ "query=")
 ....
 ```
 
-Fastly will only cache GET requests that contain a query parameter in the request url.
+Fastly will only cache GET requests that contain a query parameter in the request URL.
 
 ### Example