fix(docs): remove duplicate apt-get update steps

Signed-off-by: Chirag Ghosh <[email protected]>

Author: chirag-ghosh

versioned_docs/version-2.0.0/keploy-explained/mac-linux.md

@@ -113,10 +113,6 @@ echo \
 sudo apt-get -y update
 ```
 
-```bash
-sudo apt-get -y update
-```
-
 ```bash
 sudo apt-get -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
 ```