Temporary anchor for ES|QL multi-value controls link (elastic#3526)

Part of elastic#3315

A new link in the product will target a section that has yet to be
created about ES|QL multi-value controls.

Adding an anchor to provide a link to the product team while I start
working on the new section (that will use this same anchor value)

Author: florent-leborgne

explore-analyze/query-filter/languages/esql-kibana.md

@@ -190,6 +190,9 @@ FROM kibana_sample_data_logs
 
 To display data within a specified time range, you can use the standard time filter, custom time parameters, or a WHERE command.
 
+% DO NOT REMOVE - Link from the product, will become a real section link shortly
+$$$esql-multi-values-controls$$$
+
 
 #### Standard time filter [_standard_time_filter]