fix doc

docs/reference/search/retriever.asciidoc

@@ -382,7 +382,7 @@ For the `standard` and `knn` retrievers, the `window_size` parameter specifies t
 
 For compound retrievers like `rrf`, the `window_size` parameter defines the total number of documents examined globally.
 
-When using the `rescorer`, an error is returned when:
+When using the `rescorer`, an error is returned if the following conditions are not met:
 
 * The minimum configured rescore's `window_size` is:
 ** Greater than or equal to the `size` of the parent retriever for nested `rescorer` setups.
@@ -480,6 +480,7 @@ GET movies/_search
   }
 }
 ----
+// TEST[skip:uses ELSER]
 
 <1> Specifies the number of top documents to return in the final response.
 <2> A `rescorer` retriever applied as the final step.