Update configuration.md (#30695)

* Update configuration.md

Corrected several typos and included words that were originally left out to ensure proper grammar in document.

* Update docs/sources/administration/configuration.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: Dave Henderson <dhenderson@gmail.com>

docs/sources/administration/configuration.md

@@ -202,15 +202,14 @@ Or redirect port 80 to the Grafana port using:
 $ sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3000
 ```
 
-Another way is put a webserver like Nginx or Apache in front of Grafana and have them proxy requests to Grafana.
+Another way is to put a web server like Nginx or Apache in front of Grafana and have them proxy requests to Grafana.
 
 ### domain
 
-This setting is only used in as a part of the `root_url` setting (see below). Important if you use GitHub or Google OAuth.
 
 ### enforce_domain
 
-Redirect to correct domain if host header does not match domain. Prevents DNS rebinding attacks. Default is `false`.
+Redirect to correct domain if the host header does not match the domain. Prevents DNS rebinding attacks. Default is `false`.
 
 ### root_url