Slightly revise CLI help texts.

[csadorf]

No description provided.

[codecov]

Codecov Report

Merging #93 (70c424d) into main (4dcf83f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   83.65%   83.65%           
=======================================
  Files           5        5           
  Lines         771      771           
=======================================
  Hits          645      645           
  Misses        126      126           

Flag	Coverage Δ
py-3.10	83.39% <ø> (ø)
py-3.7	82.81% <ø> (ø)
py-3.8	83.33% <ø> (ø)
py-3.9	83.59% <ø> (ø)

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Impacted Files	Coverage Δ
aiidalab_launch/__main__.py	79.39% <ø> (ø)

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