Tweak example for using variable defined by fn.

website/ref/language.md

@@ -2017,14 +2017,12 @@ recursive functions:
 ```
 
 Under the hood, `fn` defines a variable with the given name plus `~` (see
-[variable suffix](#variable-suffix)).
+[variable suffix](#variable-suffix)). Example:
 
 ```elvish-transcript
-~> fn f []{ echo hello from f }
-~> f
-hello from f
-~> ff = $f~
-~> $ff
+~> fn f { echo hello from f }
+~> var v = $f~
+~> $v
 hello from f
 ```