Random beacon comments

[tarakby]

Updates to the DKG/Random beacon related docs:

• clarify that the set ℛ (the set of nodes able to participate in the random beacon) is a subset of 𝒟 ∩ 𝒞.
• clarify that the protocol software implements a sanity check but does not guarantee that |ℛ| is in the safe range.
• minor clarifications about the DKG results and indices

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 41.71%. Comparing base (5ae48c4) to head (280a91b).

Files with missing lines	Patch %	Lines
model/convert/service_event.go	0.00%	3 Missing ⚠️
cmd/bootstrap/run/qc.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/efm-recovery    #6590      +/-   ##
========================================================
- Coverage                 41.72%   41.71%   -0.01%     
========================================================
  Files                      2019     2028       +9     
  Lines                    179401   180208     +807     
========================================================
+ Hits                      74849    75182     +333     
- Misses                    98395    98831     +436     
- Partials                   6157     6195      +38     

Flag	Coverage Δ
unittests	41.71% <0.00%> (-0.01%)	⬇️

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