Fix format arg help text for show command

[tvoirand]

Hi,

I think I saw an error in the show CLI command, where the format argument's help text looked like a remaining copy-paste.

I hope this helps!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.05%. Comparing base (f9baa28) to head (cf65ec2).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #251   +/-   ##
=======================================
  Coverage   94.05%   94.05%           
=======================================
  Files          26       26           
  Lines        1716     1716           
  Branches      232      232           
=======================================
  Hits         1614     1614           
  Misses         75       75           
  Partials       27       27           

Flag	Coverage Δ
python-3.10	?
python-3.11	94.05% <ø> (ø)
python-3.8	93.91% <ø> (ø)
python-3.9	93.97% <ø> (ø)

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