## Description
Update 0.294 release notes about executable jars, related to PR
prestodb/prestodb.github.io#303

## Motivation and Context
prestodb/prestodb.github.io#303

## Impact
0.294 release notes

## Test Plan
N/A

## Contributor checklist

- [ ] Please make sure your submission complies with our [contributing
guide](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md),
in particular [code
style](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md#code-style)
and [commit
standards](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md#commit-standards).
- [ ] PR description addresses the issue accurately and concisely. If
the change is non-trivial, a GitHub Issue is referenced.
- [ ] Documented new properties (with its default value), SQL syntax,
functions, or other functionality.
- [ ] If release notes are required, they follow the [release notes
guidelines](https://github.com/prestodb/presto/wiki/Release-Notes-Guidelines).
- [ ] Adequate tests were added if applicable.
- [ ] CI passed.

## Release Notes
Please follow [release notes
guidelines](https://github.com/prestodb/presto/wiki/Release-Notes-Guidelines)
and fill in the release notes below.

```
== NO RELEASE NOTE ==
```

## Summary by Sourcery

Documentation:
- Add details on building and running executable JARs in the 0.294
release notes

---------

Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>
Co-authored-by: Steve Burnett <burnett@pobox.com>