Pysdc

Minor edits

Minor bugfixes and typo corrections, thanks jbschroder

Code release for the article


misc{akramov2023spectral,
title={Spectral deferred correction methods for second-order problems},
author={Ikrom Akramov and Sebastian Götschel and Michael Minion and Daniel Ruprecht and Robert Speck},
year={2023},
eprint={2310.08352},
archivePrefix={arXiv},
primaryClass={math.NA}
}


Does also contain updates for the FEniCS examples.

In this release a lot of cleanup happened, including much better documentation. pySDC learned about new time-steppers and now has even more projects to play with. Thanks to [brownbaerchen](https://github.com/brownbaerchen), [tlunet](https://github.com/tlunet), [lisawim](https://github.com/lisawim), [ikrom96git](https://github.com/ikrom96git).

This release mainly provides changes under the hood to prepare for Version 6 of pySDC. More in the release notes.

This version marks significant changes in the documentation and a few key updates in terms of functionality. See the changelog for more details! Thanks to [\brownbaerchen](https://github.com/brownbaerchen), [\tlunet](https://github.com/tlunet), [\lisawim](https://github.com/lisawim)!