adding docs again

docs/_functions/record/TTL.md

@@ -0,0 +1,20 @@
+---
+name: TTL
+parameters:
+  - ttl
+---
+
+TTL sets the TTL for a single record only. This will take precedence
+over the domain's [DefaultTTL](#DefaultTTL) if supplied.
+
+{% include startExample.html %}
+{% highlight js %}
+
+D("example.com", REGISTRAR, DnsProvider("R53"),
+  DefaultTTL(2000),
+  A("@","1.2.3.4"), //has default
+  A("foo", "2.3.4.5", TTL(500)) //overrides default
+);
+
+{%endhighlight%}
+{% include endExample.html %}