DOCS: Documentation directory structure (#2905)

documentation/language-reference/record-modifiers/TTL.md

@@ -0,0 +1,37 @@
+---
+name: TTL
+parameters:
+  - ttl
+parameter_types:
+  ttl: Duration
+---
+
+TTL sets the TTL for a single record only. This will take precedence
+over the domain's [DefaultTTL](../domain-modifiers/DefaultTTL.md) if supplied.
+
+The value can be:
+
+  * An integer (number of seconds). Example: `600`
+  * A string: Integer with single-letter unit: Example: `5m`
+  * The unit denotes:
+    * s (seconds)
+    * m (minutes)
+    * h (hours)
+    * d (days)
+    * w (weeks)
+    * n (nonths) (30 days in a nonth)
+    * y (years) (If you set a TTL to a year, we assume you also do crossword puzzles in pen. Show off!)
+    * If no unit is specified, the default is seconds.
+  * We highly recommend using units instead of the number of seconds. Would your coworkers understand your intention better if you wrote `14400` or `'4h'`?
+
+{% code title="dnsconfig.js" %}
+```javascript
+D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
+  DefaultTTL(2000),
+  A("@","1.2.3.4"), // uses default
+  A("foo", "2.3.4.5", TTL(500)), // overrides default
+  A("demo1", "3.4.5.11", TTL("5d")),  // 5 days
+  A("demo2", "3.4.5.12", TTL("5w")),  // 5 weeks
+);
+```
+{% endcode %}