Update README.md

README.md

@@ -85,5 +85,5 @@ Starting on October 26, 2020.
 
 ## Where to ask questions?
 
-If you have questions, you can ask us during the exercise sessions (every Tuesday at 4.15pm) using the Zoom in-meeting chat or in the #exercise channel on (slack)[adv-net20.slack.com]. You can post more general questions on the (moodle)[https://moodle-app2.let.ethz.ch/] forum.  
+If you have questions, you can ask us during the exercise sessions (every Tuesday at 4.15pm) using the Zoom in-meeting chat or in the #exercise channel on [slack](adv-net20.slack.com). You can post more general questions on the [moodle](https://moodle-app2.let.ethz.ch/) forum.  
 Please do **not** ask us question by email.
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