Fix comment so it does not reference the old procedure name ps_analyze_statement_digest

Author: JesperWisborgKrogh

procedures/ps_trace_statement_digest.sql

@@ -64,7 +64,7 @@ CREATE DEFINER='root'@'localhost' PROCEDURE ps_trace_statement_digest (
              Example
              -----------
 
-             mysql> call ps_analyze_statement_digest(\'891ec6860f98ba46d89dd20b0c03652c\', 10, 0.1, true, true);
+             mysql> call ps_trace_statement_digest(\'891ec6860f98ba46d89dd20b0c03652c\', 10, 0.1, true, true);
              +--------------------+
              | SUMMARY STATISTICS |
              +--------------------+