remove mention of --platform linux/amd64

Author: chendaniely

book/lectures/120-containerization-3.qmd

@@ -105,11 +105,6 @@ Here we say `.`, meaning the current working directory:
 docker build --tag testing_cmds .
 ```
 
-:::{.callout-note}
-Note: If you are running a computer using an ARM chip
-remember to add `--platform=linux/amd64`
-:::
-
 Now we will run our image (named `testing_cmds`).
 Note that we run this not using the Jupyter web app
 because all we are doing right now is testing out installation commands.