fixes #112 - typo in column name in bad/good example

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/8-sequences/g-7810.md

@@ -11,7 +11,7 @@ Since ORACLE 11g it is no longer needed to use a `select` statement to read a se
 
 ``` sql
 declare
-   l_sequence_number employees.emloyee_id%type;
+   l_sequence_number employees.employee_id%type;
 begin
    select employees_seq.nextval
      into l_sequence_number
@@ -24,7 +24,7 @@ end;
 
 ``` sql
 declare
-   l_sequence_number employees.emloyee_id%type;
+   l_sequence_number employees.employee_id%type;
 begin
    l_sequence_number := employees_seq.nextval;
 end;