DOCS: Migrated documentation website to Gitbook (#1809)

documentation/functions/domain/NAMESERVER_TTL.md

@@ -0,0 +1,20 @@
+---
+name: NAMESERVER_TTL
+parameters:
+  - ttl
+parameter_types:
+  ttl: Duration
+  target: string
+  modifiers...: RecordModifier[]
+---
+
+TTL sets the TTL on the domain apex NS RRs defined by [NAMESERVER](NAMESERVER.md).
+
+The value can be an integer or a string. See [TTL](../record/TTL.md) for examples.
+
+```javascript
+D('example.com', REGISTRAR, DnsProvider('R53'),
+  NAMESERVER_TTL('2d'),
+  NAMESERVER('ns')
+);
+```