Clarify when pre-prints should be cited

[brian-knosp]

In Module 2 needs more context on Slide 85 ("Pre-Prints"). One bullet says on the 4th bullet "Versions and Citations" says that citing pre-prints is encouraged but there are a number of instance where citing a pre-print is inappropriate. For example, if the preprint is old and has been rejected by a journal it shouldn't be citied. It also shouldn't be cited if a full, published version is available. We might want to add some context or additional information in Mod 2 (and Mod 5) about when and when not to cite pre-prints.

[bressler95tops]

Thank you @brian-knosp we will review your submissions and will let you know if we have any questions for you.

[bressler95tops]

https://github.com/nasa/Transform-to-Open-Science/tree/open-science-101/Module_2/Lesson_5#tools-for-open-publications

@brian-knosp we will be changing that definition to:

Versions and Citations: Pre-prints can have different versions, and the final peer- reviewed paper may differ. Pre-prints may be cited when discussing ongoing research, allowing for transparency in the academic discourse.

Note: if the preprint is old and has been rejected by a journal it shouldn't be cited. It also shouldn't be cited if a full published version is available.

[bressler95tops]

@katblanchette got the changes for this merged in PR #875. Likewise, the exact change can be seen on the files changed tab of that PR. Let me know when the MOOC developers have had a chance to implement this.