add pip install flytekitplugins-envd (#5257)

Signed-off-by: Future-Outlier <[email protected]>

docs/user_guide/environment_setup.md

@@ -235,6 +235,7 @@ before you submit your workflow, you will need to inform `envd` how to push the
 This can be done via:
 
 ```
+pip install flytekitplugins-envd
 envd context create --name flyte-sandbox --builder tcp --builder-address localhost:30003 --use
 ```