📝 Add note giving credit for illustrations to Ketrina Thompson (tiang…

…olo#5284)

docs/en/docs/async.md

@@ -136,6 +136,9 @@ You and your crush eat the burgers and have a nice time. ✨
 
 <img src="/img/async/concurrent-burgers/concurrent-burgers-07.png" class="illustration">
 
+!!! info
+    Beautiful illustrations by <a href="https://www.instagram.com/ketrinadrawsalot" class="external-link" target="_blank">Ketrina Thompson</a>. 🎨
+
 ---
 
 Imagine you are the computer / program 🤖 in that story.
@@ -196,6 +199,9 @@ You just eat them, and you are done. ⏹
 
 There was not much talk or flirting as most of the time was spent waiting 🕙 in front of the counter. 😞
 
+!!! info
+    Beautiful illustrations by <a href="https://www.instagram.com/ketrinadrawsalot" class="external-link" target="_blank">Ketrina Thompson</a>. 🎨
+
 ---
 
 In this scenario of the parallel burgers, you are a computer / program 🤖 with two processors (you and your crush), both waiting 🕙 and dedicating their attention ⏯ to be "waiting on the counter" 🕙 for a long time.