Update article.md

Repeated word in the description of alert
javascript-tutorial · May 2, 2020 · 0835b11 · 0835b11
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diff --git a/1-js/02-first-steps/06-alert-prompt-confirm/article.md b/1-js/02-first-steps/06-alert-prompt-confirm/article.md
@@ -4,7 +4,7 @@ As we'll be using the browser as our demo environment, let's see a couple of fun
 
 ## alert
 
-This one we've seen already. It shows shows a message and waits for the user to presses "OK".
+This one we've seen already. It shows a message and waits for the user to presses "OK".
 
 For example: