Add information on how to update the Zenodo record

[diehlpk]

Recently, some author had a different title and list of authors for the Zenodo archive. They were not aware how to change that, and we had to provide these details. I added some instructions to the documentation.

[emdupre]

Would it make sense to put each sentence on a new line for easy diff-ing in the future?

Also, it might make sense to directly link to the Zenodo guide in case they update the procedure: https://help.zenodo.org/#technical

and/or their note re: editing the title does not mint a new DOI : https://help.zenodo.org/#versioning