[crmsh-4.6] Dev: ui_cluster: Hint the watchdog option should be used with sbd option

[liangxin1300]

Backport from #1947

[codecov[bot]]

Codecov Report

:x: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 67.70%. Comparing base (52a1e2b) to head (b10cfc7).

Files with missing lines	Patch %	Lines
crmsh/bootstrap.py	66.66%	1 Missing :warning:

Additional details and impacted files

Flag	Coverage Δ
integration	54.30% <66.66%> (-0.02%)	:arrow_down:
unit	49.26% <66.66%> (+<0.01%)	:arrow_up:

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Files with missing lines	Coverage Δ
crmsh/ui_cluster.py	72.47% <ø> (ø)
crmsh/bootstrap.py	84.77% <66.66%> (-0.03%)	:arrow_down:

... and 2 files with indirect coverage changes

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