Align feature name with dash and refer existing zone process

Author: RebeccaTamachiro

src/content/docs/dns/additional-options/dns-zone-defaults.mdx

@@ -28,7 +28,7 @@ The values you select for the listed settings will be automatically applied to n
 For primary zones:
 
 - [Multi-provider DNS](/dns/nameservers/nameserver-options/#multi-provider-dns): Control whether or not Cloudflare will consider `NS` records you add on the zone apex and if zones that contain external nameservers listed in the registrar will be activated.
-- [NS record TTL](/dns/nameservers/nameserver-options/#ns-record-ttl): Control how long, in minutes, your nameserver (`NS`) records are cached. The default time-to-live (TTL) is 24 hours. This setting applies both to Cloudflare nameservers and [custom nameservers](/dns/nameservers/custom-nameservers/).
+- [NS record TTL](/dns/nameservers/nameserver-options/#nameserver-ttl): Control how long, in minutes, your nameserver (`NS`) records are cached. The default time-to-live (TTL) is 24 hours. This setting applies both to Cloudflare nameservers and [custom nameservers](/dns/nameservers/custom-nameservers/).
 - [SOA record](/dns/manage-dns-records/reference/dns-record-types/#soa): Adjust values for the start of authority (SOA) record that Cloudflare creates for your zone.
 
 For secondary zones:

src/content/docs/dns/manage-dns-records/reference/ttl.mdx

@@ -27,3 +27,7 @@ It may take longer than 5 minutes for you to actually experience record changes,
 ## Unproxied records
 
 For **DNS only** records, you can choose a TTL between **30 seconds** (Enterprise) or **60 seconds** (non-Enterprise) and **1 day**.
+
+:::note
+[Nameserver TTL](/dns/nameservers/nameserver-options/#nameserver-ttl) is a separate feature and only affects Cloudflare nameservers (standard or advanced) and custom nameservers. For other NS records on your DNS records table, TTL is controlled by their respective TTL fields.
+:::

src/content/docs/dns/nameservers/nameserver-options.mdx

@@ -52,9 +52,9 @@ If you choose this option and you also want to use DNSSEC on your zone, make sur
 
 :::
 
-## NS record TTL
+## Nameserver TTL
 
-For both Cloudflare nameservers (standard or advanced) and custom nameservers, the `NS` record time-to-live (TTL) is controlled by the specific setting in **DNS** > **Records**.
+For both Cloudflare nameservers (standard or advanced) and custom nameservers, the `NS` record time-to-live (TTL) is controlled by the specific setting in **DNS** > **Records** > **DNS record options**.
 
 The default TTL is 24 hours (or 86,400 seconds), but you have the option to lower this value depending on your needs. For example, shorter TTLs can be useful when you are changing nameservers or migrating a zone. Accepted values range from 30 to 86,400 seconds.