documentation: Add dry dep description to BVOC section, and add references

[lkemmons]

Description of changes

Added description of Dry Deposition calculated in CTSM to the BVOC section of Tech Note.

Specific notes

Contributors other than yourself, if any:
n/a

CTSM issues resolved or otherwise addressed, if any:
add documentation per
#4032 (comment)

Testing planned or performed, if any:
documentation only

Requirements before merge:

• [ x] I have followed the CTSM contribution guidelines.

[github-actions]

❌ Docs build failed

Build logs

Cleaning documentation build directory...
Done.
Building documentation...
/home/user/mounted_home/doc/source/tech_note/Introduction/CLM50_Tech_Note_Introduction.rst:174: WARNING: undefined label: 'rst_biogenic volatile organic compounds (bvocs)' [ref.numref]
Documentation build completed, but with problems that must be resolved.
Re-run with --verbose for full output.