Mention support for ipynb technotes

changelog.d/20240326_120624_jsick_DM_43485.md

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-### Backwards-incompatible changes
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 ### New features
 
-- Rubin user guides (`documenteer.conf.guide`) now include [MyST-NB](https://myst-nb.readthedocs.io/en/latest/) to support Jupyter Notebooks in Sphinx documentation. The MyST-NB extension also supersedes `MyST-Parser` for Markdown syntax support.
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-### Bug fixes
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-### Other changes
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+- Rubin user guides (`documenteer.conf.guide`) and technotes (`documenteer.conf.technote`) now include [MyST-NB](https://myst-nb.readthedocs.io/en/latest/) to support Jupyter Notebooks in Sphinx documentation. The MyST-NB extension also supersedes MyST-Parser for Markdown syntax support. For guides, Jupyter Notebook files can be intermixed with Markdown (`.md`) and reStructuredText (`.rst`) files. An `ipynb` file is considered as a page in the documentation. For technotes, the Jupyter Notebook must be named `index.ipynb`. By default, these configurations use MyST-NB's "auto" mode for notebook execution: only if a notebook is missing outputs will it be executed.