[Fundamentals] Update index.mdx (#23533)

Author: nenizera

src/content/docs/fundamentals/manage-domains/index.mdx

@@ -6,9 +6,9 @@ sidebar:
 
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-A *domain* or *domain name* is the location of a website or application, or what an end user types into their browser to get to your website (`example.com`).
+A *domain* or *domain name* (also known as a *zone*) is the location of a website or application, or what an end user types into their browser to get to your website (`example.com`).
 
-## Get a domain name
+## Get a domain name 
 
 You can purchase domain names for your website from a variety of places, such as through popular website builders or dedicated [registrars](https://www.cloudflare.com/learning/dns/glossary/what-is-a-domain-name-registrar/).