Kinetics libraries could include more `shortDesc` strings

[jonwzheng]

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As per https://github.com/ReactionMechanismGenerator/RMG-Py/pull/2703#pullrequestreview-2618475656, many of the libraries on https://rmg.mit.edu/database/kinetics/libraries/ don't currently have shortDesc, and could be made more descriptive to database users by including these fields.

Some existing descriptions could be improved as well, for example BurkeH2O2inArHe has the same description as BurkeH2O2inN2. Descriptions in general are not systematically named.

Example: