Update authentication.md (#5316)

[http] section does NOT apply to meta nodes.

Same issue here - https://github.com/influxdata/DAR/issues/326

Co-authored-by: Jason Stirnaman <stirnamanj@gmail.com>

content/enterprise_influxdb/v1/administration/configure/security/authentication.md

@@ -36,7 +36,7 @@ To enable authentication in a cluster, do the following:
    - `<admin_password>`: Admin password
 
 2. Set `auth-enabled` to `true` in the `[http]` section of the configuration files 
-   for all meta **and** data nodes:
+   for all data nodes:
 
    ```toml
    [http]