chore(gnokey): update long help

[leohhhn]

Description

This PR updates the gnokey long help text.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.21%. Comparing base (8bd07c9) to head (af80ee5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2712    +/-   ##
========================================
  Coverage   60.21%   60.21%            
========================================
  Files         561      561            
  Lines       75071    75274   +203     
========================================
+ Hits        45205    45328   +123     
- Misses      26485    26540    +55     
- Partials     3381     3406    +25     

Flag	Coverage Δ
contribs/gnodev	61.40% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	64.75% <100.00%> (ø)
gnovm	64.33% <ø> (+0.02%)	⬆️
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (-0.36%)	⬇️
tm2	62.01% <ø> (-0.01%)	⬇️

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