Change help for the `choco search` command to expand on `--all-versions` option

### Checklist

- [x] I have verified this is the correct repository for opening this issue.
- [x] I have verified no other issues exist related to my request.

### Is Your Feature Request Related To A Problem? Please describe.

In the help for the `choco search` command, the `--all-versions` option states:

```
-a, --all, --allversions, --all-versions
AllVersions - include results from all versions.
```

While this is technically true, I feel it could be expanded to be clearer and have more detail. Before I got clarification, I would've expected that passing `--all-versions` would get me _all versions_; prereleases included. I'd like to see the help changed to be clearer with what's actually happening, like this:

```
-a, --all, --allversions, --all-versions
AllVersions - include results from all stable versions. To include results for all packages, add --prerelease to the command.
```
Or something similar. I'm happy to workshop this more until we get it where we like it.

### Describe The Solution. Why is it needed?

Clear documentation provides users with the ability to help themselves. Documentation can never be _too_ helpful.

### Additional Context

N/A

### Related Issues

- [Internal issue](https://gitlab.com/chocolatey/solutions/support-issues/-/issues/139)

Search the repository for the exact `AllVersions - include results from all versions.` help text and inspect the surrounding `choco search` command documentation. Update the `--all-versions` description to clarify stable-version behavior and how `--prerelease` affects results, then verify the revised text in the command help.

Written by the indexing model from the issue text.