The demo app needs "dotnet add package Lucene.Net.Analysis.Common --prerelease"

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the documentation issue

The demo app on https://lucenenet.apache.org/ does only compile after adding the package Lucene.Net.Analysis.Common.

### Additional context

_No response_

Start at the demo app documentation on https://lucenenet.apache.org/ and reproduce the compile failure described in the issue. Update the setup instructions to include the Lucene.Net.Analysis.Common prerelease package command, then verify that the demo app compiles from the documented steps.

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