Better support for nested types

```lua
---Arguments
---@type table<string, string|table<string>>
M.types = {
  ["--wrap"] = { "auto", "none", "preserve" },
  ["--ascii"] = "flag",
}
```

Output:

```vim
M.types                                                                *M.types*
    Arguments

    Type: ~
        (table<string,)  string|table<string>>

```

Another case: `table<string, string[]|string>`