MOM documentation update

[marshallward]

Updates to the MOM6 documentation in prep for the MOM6 tutorial. Made some general edits to a few of the top level documents for notation, citations, wording, and clean up of a few typos and mistakes.

Submitting on behalf of @StephenGriffies , this is a substitute for #216

[codecov]

Codecov Report

Merging #218 (be6d702) into dev/gfdl (d214ad8) will decrease coverage by 0.40%.
The diff coverage is n/a.

❗ Current head be6d702 differs from pull request most recent head 274e5dc. Consider uploading reports for the commit 274e5dc to get more accurate results

@@             Coverage Diff              @@
##           dev/gfdl     #218      +/-   ##
============================================
- Coverage     37.38%   36.98%   -0.41%     
============================================
  Files           262      262              
  Lines         72472    72236     -236     
  Branches      13537    13464      -73     
============================================
- Hits          27096    26717     -379     
- Misses        40369    40637     +268     
+ Partials       5007     4882     -125     

Impacted Files	Coverage Δ
src/core/MOM_open_boundary.F90	25.33% <0.00%> (-3.67%)	⬇️
src/core/MOM_dynamics_split_RK2.F90	80.39% <0.00%> (+16.83%)	⬆️

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