fix syntax errors in good and bad example of G-7910

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/9-sql-macros/g-7910.md

@@ -16,15 +16,15 @@ Logging macro calls via a call to a procedure that does DML in an autonomous tra
 ## Example (bad)
 
 ``` sql
-create or replace function row_generator (
-   num_rows_in in number(32,0)
+create or replace function row_generator(
+   num_rows_in in number
 )
    return varchar2 sql_macro as
 begin
-   insert into function_calls(name, called_at, parameter_value)
-      values ($$PLSQL_UNIT, current_timestamp, num_rows_in);
+   insert into function_calls(name,called_at,parameter_value)
+   values ($$plsql_unit,current_timestamp,num_rows_in);
    commit;
-   
+
    return 'select level as row_sequence from dual connect by level <= num_rows_in';
 end row_generator;
 /
@@ -33,8 +33,8 @@ end row_generator;
 ## Example (good)
 
 ``` sql
-create or replace function row_generator (
-   num_rows_in in number(32,0)
+create or replace function row_generator(
+   num_rows_in in number
 )
    return varchar2 sql_macro as
 begin