access_control.md: revise sql_examples

docs/tutorial/access_control.md

@@ -459,21 +459,25 @@ GRANT WRITE ON TABLE <table name> TO <grantee>
 GRANT CREATE TABLE TO <grantee>
 GRANT CREATE ROLE TO <grantee>
 GRANT CREATE USER TO <grantee>
+GRANT CREATE PROCEDURE TO <grantee>
 
-GRANT ALTER TABLE TO <grantee> // alter any table
+GRANT ALTER TABLE TO <grantee> -- alter any table
+GRANT ALTER USER TO <grantee> -- alter any user
+GRANT ALTER PROCEDURE TO <grantee> -- alter any procedure
 GRANT ALTER ON TABLE <table name> TO <grantee>
-GRANT ALTER USER to <grantee>
 GRANT ALTER ON USER <user name> to <grantee>
+GRANT ALTER ON PROCEDURE <procedure name> TO <grantee>
 
-GRANT DROP TABLE TO <grantee>
-GRANT DROP USER TO <grantee>
-GRANT DROP ROLE TO <grantee>
+GRANT DROP TABLE TO <grantee> -- drop any table
+GRANT DROP USER TO <grantee> -- drop any user
+GRANT DROP ROLE TO <grantee> -- drop any role
+GRANT DROP PROCEDURE TO <grantee> -- drop any procedure
 GRANT DROP ON TABLE <table name> TO <grantee>
 GRANT DROP ON USER <user name> TO <grantee>
 GRANT DROP ON ROLE <role name> TO <grantee>
+GRANT DROP ON PROCEDURE <procedure name> TO <grantee>
 
 GRANT EXECUTE ON PROCEDURE <proc name> TO <grantee>
-GRANT DROP ON PROCEDURE <proc name> TO <grantee>
 
 GRANT <role name> TO <grantee>
 ```