remove redundant sentence

docs/docs/installation/pypi.mdx

@@ -131,7 +131,7 @@ export SUPERSET_CONFIG_PATH=superset/superset_config.py
 ```
 Note that this stores the path in the environment only temporarily.  If you wish for this to persist through reboots, permanently set this environment variable by [adding it to your `~/.profile` file](https://unix.stackexchange.com/questions/117467/how-to-permanently-set-environmental-variables).
 
-Superset won't start without being given a `SECRET_KEY` that it will use for encryption. Generate a strong key and write it to your config file:
+Now generate a strong value for `SECRET_KEY` and write it to your config file:
 ```
 echo "SECRET_KEY='$(openssl rand -base64 42)'" | tee -a superset/superset_config.py
 ```