further simplified the words in the document

I made changes to some of the words used by simplifying them to ensure that all users can easily understand the document.

docs/source/reference/config-user-env.md

@@ -140,7 +140,7 @@ By default, in a JupyterHub deployment, each user has one server only.
 JupyterHub can, however, have multiple servers per user.
 This is mostly useful in deployments where users can configure the environment in which their server will start (e.g. resource requests on an HPC cluster), so that a given user can have multiple configurations running at the same time, without having to stop and restart their own server.
 
-To allow named servers, use this:
+To allow named servers, include this code snippet in your config file:
 
 ```python
 c.JupyterHub.allow_named_servers = True
@@ -158,13 +158,13 @@ as well as the admin page:
 Named servers can be accessed, created, started, stopped, and deleted
 from these pages. Activity tracking is now per server as well.
 
-To limit the number of **named server** per user by setting a constant value, use this:
+To limit the number of **named server** per user by setting a constant value, include this code snippet in your config file:
 
 ```python
 c.JupyterHub.named_server_limit_per_user = 5
 ```
 
-Alternatively, to use a callable/awaitable based on the handler object, use this:
+Alternatively, to use a callable/awaitable based on the handler object, include this code snippet in your config file:
 
 ```python
 def named_server_limit_per_user_fn(handler):