update manual list of search functions

Author: leemthompo

docs/reference/query-languages/esql/_snippets/lists/search-functions.md

@@ -1,5 +1,5 @@
-* [`KQL`](../../functions-operators/search-functions.md#esql-kql)
-* [`MATCH`](../../functions-operators/search-functions.md#esql-match)
-* [`MATCH_PHRASE`](../../functions-operators/search-functions.md#esql-match_phrase)
-* [`QSTR`](../../functions-operators/search-functions.md#esql-qstr)
+% * [preview] [`KQL`](../../functions-operators/search-functions.md#esql-kql)
+% * [preview] [`MATCH`](../../functions-operators/search-functions.md#esql-match)
+% * [preview] [`MATCH_PHRASE`](../../functions-operators/search-functions.md#esql-match_phrase)
+% * [preview] [`QSTR`](../../functions-operators/search-functions.md#esql-qstr)
 % * [preview] [`TERM`](../../functions-operators/search-functions.md#esql-term)