Cleanup of createCommonFromGethGenesis docs

[acolytec3]

Cleanup item from #3556 to fix code docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (d7d1dab) to head (16f1f9e).
Report is 2 commits behind head on master.

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HEAD has 8 uploads less than BASE

Flag	BASE (d7d1dab)	HEAD (16f1f9e)
statemanager	1	0
blockchain	1	0
trie	1	0
block	1	0
genesis	1	0
util	1	0
devp2p	1	0
common	1	0

Additional details and impacted files

Flag	Coverage Δ
block	?
blockchain	?
common	?
devp2p	?
genesis	?
statemanager	?
trie	?
util	?
wallet	0.00% <ø> (?)

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[holgerd77]

👍