docs: Populating form - HTML escape (marimo-team#2981)

## 📝 Summary

marimo-team#2979 (comment)
After checking the updated website, noticed that the query parameter in
the link to notebook got reformatted to
`https://marimo.app/l/w21a3x?t1=query&t2=params` - which breaks the
notebook.

## 🔍 Description of Changes

try HTML instead of Markdown link

## 📋 Checklist

- [x] I have read the [contributor
guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md).
- [x] For large changes, or changes that affect the public API: this
change was discussed or approved through an issue, on
[Discord](https://marimo.io/discord?ref=pr), or the community
[discussions](https://github.com/marimo-team/marimo/discussions) (Please
provide a link if applicable).
- [x] I have added tests for the changes made.
- [x] I have run the code and verified that it works as expected.

## 📜 Reviewers
 @mscolnick

docs/recipes.md

@@ -398,7 +398,7 @@ form.value
 ### Populating form with pre-defined examples
 
 **Use cases.** To give examples of how a filled form looks like.  Useful for illustrating complex API requests or database queries.
-The form can also be populated from [URL query parameters](https://docs.marimo.io/api/query_params.html) ([example](https://marimo.app/l/w21a3x?t1=query&t2=params)).
+The form can also be populated from [URL query parameters](https://docs.marimo.io/api/query_params.html) (<a href="https://marimo.app/l/w21a3x?t1=query&t2=params">notebook example</a>).
 
 **Recipe.**