Mark epoch sync as implemented in our doc

[walnut-the-cat]

as title says

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.41%. Comparing base (7436639) to head (77ec9e4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12881      +/-   ##
==========================================
+ Coverage   70.25%   70.41%   +0.15%     
==========================================
  Files         854      854              
  Lines      174571   174571              
  Branches   174571   174571              
==========================================
+ Hits       122646   122917     +271     
+ Misses      46713    46415     -298     
- Partials     5212     5239      +27     

Flag	Coverage Δ
backward-compatibility	0.35% <ø> (?)
db-migration	0.35% <ø> (?)
genesis-check	1.40% <ø> (?)
linux	70.01% <ø> (+0.15%)	⬆️
linux-nightly	70.04% <ø> (-0.02%)	⬇️
pytests	1.71% <ø> (?)
sanity-checks	1.52% <ø> (?)
unittests	70.23% <ø> (-0.02%)	⬇️
upgradability	0.35% <ø> (?)

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