Update x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/grouping/Categorize.java

Co-authored-by: Alexander Spies <[email protected]>

Author: jan-elastic

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/grouping/Categorize.java

@@ -53,7 +53,7 @@ public class Categorize extends GroupingFunction implements Validatable {
 
             * can't be used within other expressions
             * can't be used with multiple groupings
-            * can't be used or referenced within aggregations""",
+            * can't be used or referenced within aggregate functions""",
         examples = {
             @Example(
                 file = "docs",