docs: update documentation for ipfs.dns

Author: niinpatel

SPEC/MISCELLANEOUS.md

@@ -59,7 +59,10 @@ A great source of [examples](https://github.com/ipfs/interface-ipfs-core/blob/ma
 
 > Resolve DNS links
 
-##### `ipfs.dns(domain, [callback])`
+##### `ipfs.dns(domain, [options], [callback])`
+
+- `options` is an optional object argument that might include the following properties:
+    - `recursive` (boolean, default true): resolve until result is not a domain name
 
 `callback` must follow `function (err, path) {}` signature, where `err` is an error if the operation was not successful. `path` is the IPFS path for that domain.