Update FAQ

Author: antonmedv

index.md

@@ -50,6 +50,7 @@ JSON is the most popular _data-interchange_ format. But it isn't a very good _co
 
 1. [What’s the difference between MAML and JSONC/JSON5?](https://github.com/maml-dev/maml/issues/1)
 2. [Why not Zig-style multiline?](https://github.com/maml-dev/maml/issues/3)
+3. [What about YAML?](https://github.com/maml-dev/maml/issues/6)
 
 ## Editor Support