(DOCSP-22503) Adds WHERE EXISTS to list of allowed operations

Author: Sarah Simpers

source/supported-operations.txt

@@ -78,6 +78,8 @@ Comparison Functions and Operators
      - Not equal operator
    * - ``NOT IN()``
      - Check whether a value is not within a set of values
+   * - ``WHERE EXISTS()``
+     - Test for the existence of a record you specify in a subquery
 
 Logical Operators
 -----------------