Update docs with default compat matrix details

[ridaz-zz]

What type of PR is this?
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #112

Test Report Added?:

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind TESTED
/kind NOT-TESTED

Test Report:

[codecov-commenter]

Codecov Report

Merging #138 (0502f51) into main (4adbee3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #138   +/-   ##
=======================================
  Coverage   52.12%   52.12%           
=======================================
  Files           6        6           
  Lines        1508     1508           
=======================================
  Hits          786      786           
  Misses        623      623           
  Partials       99       99           

Flag	Coverage Δ
unittests	52.12% <ø> (ø)

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[asifdxtreme]

LGTM