Update toset.mdx

Fix output in `toset`
```
toset(["a", "b", 3])
toset([
  "3",
  "a",
  "b",
])
```

This is the actual output from the tf console, using Terraform v1.1.5 on windows_amd64

website/docs/language/functions/toset.mdx

@@ -31,9 +31,9 @@ same type, mixed-typed elements will be converted to the most general type:
 ```
 > toset(["a", "b", 3])
 [
+  "3",
   "a",
   "b",
-  "3",
 ]
 ```