rename variable l_return to r_return to match naming conventions

Author: PhilippSalvisberg

docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md

@@ -13,18 +13,18 @@ This technique raises an error (`value_error`) which may not be handled in the c
 create or replace package body department_api is
    function dept_by_name(in_dept_name in departments.department_name%type)
       return departments%rowtype is
-      l_return departments%rowtype;
+      r_return departments%rowtype;
    begin
       if in_dept_name is null or length(in_dept_name) > 20 then
          raise err.e_param_to_large;
       end if;
       -- get the department by name
       select *
-        into l_return
+        into r_return
         from departments
        where department_name = in_dept_name;
 
-      return l_return;
+      return r_return;
    end dept_by_name;
 end department_api;
 /
@@ -37,15 +37,15 @@ create or replace package body department_api is
    function dept_by_name(in_dept_name in departments.department_name%type)
       return departments%rowtype is
       l_dept_name departments.department_name%type not null := in_dept_name;
-      l_return    departments%rowtype;
+      r_return    departments%rowtype;
    begin
       -- get the department by name
       select *
-        into l_return
+        into r_return
         from departments
        where department_name = l_dept_name;
 
-      return l_return;
+      return r_return;
    end dept_by_name;
 end department_api;
 /