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 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 41.71%. Comparing base (af0c50c) to head (c74dd80).
Report is 12 commits behind head on feature/efm-recovery.

Files with missing lines	Patch %	Lines
cmd/bootstrap/run/qc.go	0.00%	1 Missing ⚠️
model/convert/service_event.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/efm-recovery    #6590      +/-   ##
========================================================
- Coverage                 42.10%   41.71%   -0.40%     
========================================================
  Files                      2012     2028      +16     
  Lines                    178121   180208    +2087     
========================================================
+ Hits                      74994    75169     +175     
- Misses                    96944    98845    +1901     
- Partials                   6183     6194      +11     

Flag	Coverage Δ
unittests	41.71% <50.00%> (-0.40%)	⬇️

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