Update toset.mdx
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
hashicorp/terraform,tommynsong/terraform,rnaveiras/terraform,tommynsong/terraform,tommynsong/terraform,rnaveiras/terraform,hashicorp/terraform,hashicorp/terraform,rnaveiras/terraform