Add missing period and implement some page descriptions

Author: RebeccaTamachiro

src/content/docs/dns/index.mdx

@@ -17,7 +17,7 @@ Leverage Cloudflare's global network to deliver excellent performance and reliab
 
 Cloudflare DNS is a fast, resilient and easy-to-manage authoritative DNS service. It delivers excellent performance and reliability to your domain while also protecting your business from [DDoS attacks](https://www.cloudflare.com/learning/ddos/what-is-a-ddos-attack/) and [route leaks and hijacking](https://www.cloudflare.com/learning/security/glossary/bgp-hijacking/). To know where to begin, refer to [Get started](/dns/get-started/).
 
-Enterprise customers can also use Cloudflare DNS for their private network with [Internal DNS (Beta)](/dns/internal-dns/)
+Enterprise customers can also use Cloudflare DNS for their private network with [Internal DNS (Beta)](/dns/internal-dns/).
 
 ***
 

src/content/docs/dns/internal-dns/internal-zones/index.mdx

@@ -1,6 +1,7 @@
 ---
 pcx_content_type: concept
 title: Internal zones
+description: Explore internal DNS zones in Cloudflare. These zones organize DNS records for resources accessible only within your private network, queried via Cloudflare Gateway.
 sidebar:
   order: 2
   group:

src/content/docs/dns/internal-dns/internal-zones/internal-dns-records.mdx

@@ -1,6 +1,7 @@
 ---
 pcx_content_type: concept
 title: Manage internal DNS records
+description: Manage internal DNS records in Cloudflare. Learn about supported DNS record types and CNAME flattening.
 sidebar:
   order: 4
   label: Internal DNS records

src/content/docs/dns/internal-dns/internal-zones/reference-zones.mdx

@@ -1,6 +1,7 @@
 ---
 pcx_content_type: how-to
 title: Reference zones
+description: Learn about reference zones. Cloudflare Internal DNS allows zones to reference others for query resolution when no direct record is found.
 sidebar:
   order: 4
 ---

src/content/docs/dns/internal-dns/internal-zones/setup.mdx

@@ -1,6 +1,7 @@
 ---
 pcx_content_type: how-to
 title: Manage internal zones
+description: Understand how to set up and manage internal DNS zones with Cloudflare. Explore configuration conditions, zone creation, and available API endpoints.
 sidebar:
   order: 2
 ---