Docs: Fix typo for request cache (#25444)

Author: robin13

docs/reference/modules/indices/request_cache.asciidoc

@@ -103,7 +103,7 @@ IMPORTANT: If your query uses a script whose result is not deterministic (e.g.
 it uses a random function or references the current time) you should set the
 `request_cache` flag to `false` to disable caching for that request.
 
-Requests `size` is greater than 0 will not be cached even if the request cache is
+Requests where `size` is greater than 0 will not be cached even if the request cache is
 enabled in the index settings. To cache these requests you will need to use the
 query-string parameter detailed here.