cmd: edit flag description

[xenowits]

Edits --keymanager-addresses flag description for create cluster command.

category: refactor
ticket: #1503

[codecov]

Codecov Report

Base: 54.58% // Head: 54.65% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (671e440) compared to base (e95d9b8).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1680      +/-   ##
==========================================
+ Coverage   54.58%   54.65%   +0.06%     
==========================================
  Files         158      158              
  Lines       20545    20545              
==========================================
+ Hits        11215    11229      +14     
+ Misses       7842     7829      -13     
+ Partials     1488     1487       -1     

Impacted Files	Coverage Δ
cmd/createcluster.go	52.65% <50.00%> (ø)
app/eth2wrap/synthproposer.go	66.25% <0.00%> (-0.32%)	⬇️
app/vmock.go	74.09% <0.00%> (ø)
core/qbft/qbft.go	83.82% <0.00%> (+0.42%)	⬆️
core/scheduler/scheduler.go	74.25% <0.00%> (+0.45%)	⬆️
app/app.go	63.78% <0.00%> (+0.72%)	⬆️
core/priority/prioritiser.go	61.69% <0.00%> (+2.82%)	⬆️

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