[docs] - update docs for disk encryption

[AshleyDumaine]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.08%. Comparing base (4c013d7) to head (dbd6aaa).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #700   +/-   ##
=======================================
  Coverage   64.08%   64.08%           
=======================================
  Files          70       70           
  Lines        6296     6296           
=======================================
  Hits         4035     4035           
  Misses       1999     1999           
  Partials      262      262           

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