Modified docs

Author: mridula-s109

docs/reference/elasticsearch/rest-apis/retrievers/linear-retriever.md

@@ -31,12 +31,12 @@ Combining `query` and `retrievers` is not supported.
 `normalizer` {applies_to}`stack: ga 9.1`
 :   (Optional, String)
 
-    The normalizer to use when combining results.
+    The top-level normalizer to use when combining results.
     See [normalizers](#linear-retriever-normalizers) for supported values.
     Required when `query` is specified.
 
     When used with the [multi-field query format](../retrievers.md#multi-field-query-format) (`query` parameter), normalizes scores per [field grouping](../retrievers.md#multi-field-field-grouping).
-    When used with `retrievers`, serves as the default normalizer for any sub-retriever that doesn't specify its own normalizer. Per-retriever normalizers always take precedence over the top-level normalizer.
+    Otherwise serves as the default normalizer for any sub-retriever that doesn't specify its own normalizer. Per-retriever normalizers always take precedence over the top-level normalizer.
 
     ::::{warning}
     Avoid using `none` as that will disable normalization and may bias the result set towards lexical matches.