Fix typo in Parameterized queries example (#76)

Author: maael

content/features/2-queries.mdx

@@ -55,7 +55,7 @@ client
 
 // async/await
 try {
-  const res = await pool.query(text, values)
+  const res = await client.query(text, values)
   console.log(res.rows[0])
   // { name: 'brianc', email: 'brian.m.carlson@gmail.com' }
 } catch (err) {