A space-separated list of file or buffer names for org-ql-search is not working

Continuation of the conversation from #228

the documentation of org-ql-search states that:
> - A space-separated list of file or buffer names
when using interactively. Testing it doesn't seem to work? I tried the following for "Buffer/files:"

- `*scratch* *scratch2*`
- `"*scratch*" "*scratch2*"`
- `orgfile1.org orgfile2.org`
- `"orgfile1.org" "orgfile2.org"`

For any of the above I get something like the following when run `org-ql-search` interactively:
```
user-error: Can’t open file: "orgfile1.org" "orgfile2.org"
```
Perhaps remove that from the documentation for now?