Repl :examples Page Not Found

## Summary

There's an incorrect link in the output of `pkl repl` `:examples` that points to `https://pkl-lang.org/main/0.25.1/language-reference/`

Should this link go to `https://pkl-lang.org/main/current/language-reference/index.html`?

## Version
`pkl --version`
`Pkl 0.25.1 (macOS 14.1, native)`

## Output from
```
pkl repl
:examples
```

```shell
For more examples, see the Language Reference (Command+Double-click the link below):

https://pkl-lang.org/main/0.25.1/language-reference/
```

## Screenshot of 404

Start at the `pkl repl` command and its `:examples` output, then search the repository for the reported `0.25.1/language-reference/` URL. Done means the output links to the current Language Reference page and the link no longer returns a 404.

Written by the indexing model from the issue text.