updated BVOC documentation

[lkemmons]

Description of changes

Updated BVOC documentation

Specific notes

Contributors other than yourself, if any:
Input provided by Hui Wang (UC-Irvine), @HuiWangWanderInGitHub

CTSM Issues Fixed (include github issue #):
#3876 (comment)

Are answers expected to change (and if so in what way)?

Any User Interface Changes (namelist or namelist defaults changes)?

Does this create a need to change or add documentation? Did you do so?

Testing performed, if any:
(List what testing you did to show your changes worked as expected)
(This can be manual testing or running of the different test suites)
(Documentation on system testing is here: https://github.com/ESCOMP/ctsm/wiki/System-Testing-Guide)
(aux_clm on derecho for intel/gnu and izumi for intel/gnu/nag/nvhpc is the standard for tags on master)

NOTE: Be sure to check your coding style against the standard
(https://github.com/ESCOMP/ctsm/wiki/CTSM-coding-guidelines) and review
the list of common problems to watch out for
(https://github.com/ESCOMP/CTSM/wiki/List-of-common-problems).

[slevis-lmwg]

@lkemmons thank you for your work in this section! My review is thorough, but mostly it involves adding links to the references when each one first appears. To make things easier, I will try committing the simple suggestions if github will allow me, and I will leave only a few issues for you to resolve. Thanks again.

[slevis-lmwg]

Suggested change

	C_{C3AG} = 95 + 9.5 e^{0.53 (288.15-T_{240})}
	C_{C3AG} = 95 + 9.49 e^{0.53 (288.15-T_{240})}

[slevis-lmwg]

Ok, done committing the "obvious" ones. Here's one of the constants that I could not find in the code, but that had a likely counterpart. Did I pick the correct value?

[slevis-lmwg]

Suggested change

	E_{opt\_C3AG} = e^{0.22 (T_{240}-288.15)}
	E_{opt\_C3AG} = e^{0.217 (T_{240}-288.15)}

[slevis-lmwg]

Here's another constant that I could not find in the code. Did I pick the correct value from the code?

[slevis-lmwg]

This formula is a bit difficult to read the way that it renders. You can download to your laptop my copy of this PR's built documentation /glade/derecho/scratch/slevis/preview_docs_pr.ESCOMP.CTSM.pr-3909/ESCOMP-CTSM-a074bdb/doc/_build/html and then click on index.html to view. Here are my concerns:

• Pls confirm that the formula agrees with what's in the code

• See if you can format it to make easier to read

• Has the constant R been defined?

• Looking at this formula made me notice that several param values in this doc file didn't match the code. I have pointed out that ones that I caught. Pls confirm that I replaced them with the correct values because I mostly guessed. Also pls check that I didn't miss any. To explain, we prefer to report exact param values in the documentation to make it easier to follow the documentation alongside the code, as well as to facilitate the ability to reproduce results if one were to rewrite the model starting from the documentation.

[slevis-lmwg]

@lkemmons pls ping me here in the PR when you feel the rest can be resolved, and I will approve the PR and merge to the b4b-dev branch.