Minor documentation update for data

[lowderchris]

Minor documentation update for data, to clarify new data version, and data physical units.

[lowderchris]

Some minor documentation changes based on feedback from the PUNCH data meetings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.39%. Comparing base (4aed9d8) to head (5fcbd64).
⚠️ Report is 3 commits behind head on main.

❌ Your project status has failed because the head coverage (57.39%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #868   +/-   ##
=======================================
  Coverage   57.39%   57.39%           
=======================================
  Files         125      125           
  Lines       13882    13882           
=======================================
  Hits         7967     7967           
  Misses       5915     5915           

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