fix: typo (#649)

Author: chewam

examples/src/agents/sql.ts

@@ -15,9 +15,9 @@ export const run = async () => {
   const db = await SqlDatabase.fromDataSourceParams({
     appDataSource: datasource,
   });
-  const tookit = new SqlToolkit(db);
+  const toolkit = new SqlToolkit(db);
   const model = new OpenAI({ temperature: 0 });
-  const executor = createSqlAgent(model, tookit);
+  const executor = createSqlAgent(model, toolkit);
 
   const input = `List the total sales per country. Which country's customers spent the most?`;