Update citation files (#13416) (#13417)
* The author metadata of the BibTex example is now correctly formatted with last names following first names.
* An example of BibLaTex has been added.
* BibTex and BibLaTex examples now clearly indicate that what is cited is software.
Closes #13415
(cherry picked from commit 44deff97cde6ea2847c4d9da6dc057189cdb4358)
Co-authored-by: Will Riley <wanderingwill@gmail.com>
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