ESQL: Fix docs grammar (elastic#134138)

`using using` isn't right.

Relates to elastic#133892

Author: nik9000

docs/reference/query-languages/esql/kibana/definition/operators/not rlike.json

@@ -32,7 +32,7 @@ public class RLike extends RegexMatch<RLikePattern> {
     public static final String NAME = "RLIKE";
 
     @FunctionInfo(returnType = "boolean", description = """
-        Use `RLIKE` to filter data based on string patterns using using
+        Use `RLIKE` to filter data based on string patterns using
         <<regexp-syntax,regular expressions>>. `RLIKE` usually acts on a field placed on
         the left-hand side of the operator, but it can also act on a constant (literal)
         expression. The right-hand side of the operator represents the pattern.""", detailedDescription = """