docs: Add OpenSSL 3.5+ requirement for Post-Quantum TLS support

[vedant-jaiswal]

Issue #, if available:

Description of changes:
Added documentation for OpenSSL 3.5+ requirement to support Post-Quantum TLS.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (04e5987) to head (feaa107).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files           8        8           
  Lines         270      270           
=======================================
  Hits          265      265           
  Misses          5        5           

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