remove text from retro block

common-content/en/blocks/retro/index.md

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-{{<tabs name="Run a retro">}}
-{{<tab name="Video">}}
 {{<youtube>}}https://www.youtube.com/watch?v=dY6yFsgLrBA{{</youtube>}}
-{{</tab>}}
-{{<tab name="Text">}}
 
 {{<note title="Retro (20 minutes)" type="activity">}}
 A retro is a chance to reflect on this past sprint. You can do this on [a Jamboard](https://jamboard.google.com/d/1u7oF-r7AKtkNu_OIW_K1ai0SNQfT_YuCCsiNo3MOwUc/edit?usp=sharing) (make sure someone clicks "Make a copy" before you start, and you work on that together) or on sticky notes on a wall.
 
-1. Set a [timer for 5 minutes](https://www.google.com/search?q=timer+5+minutes).
-1. Write down as many things as you can think of that you'd like to _start_, _stop_, and _continue_ doing next sprint.
-1. Write one point per note and keep it short.
-1. When the timer goes off, one person should set a [timer for 1 minute](https://www.google.com/search?q=timer+1+minute) and group the notes into themes.
-1. Next, set a [timer for 2 minutes](https://www.google.com/search?q=timer+2+minutes) and all vote on the most important themes by adding a dot or a +1 to the note.
-1. Finally, set a [timer for 8 minutes](https://www.google.com/search?q=timer+8+minutes) and all discuss the top three themes.
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 {{</note>}}
-{{</tab>}}
-
-{{</tabs>}}