Slight Clap help text improvements

[jounathaen]

Reordered clap arguments and improved GuestMemorySize printing

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.26%. Comparing base (b04fc32) to head (5483890).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/params.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #885   +/-   ##
=======================================
  Coverage   70.26%   70.26%           
=======================================
  Files          24       24           
  Lines        2959     2959           
=======================================
  Hits         2079     2079           
  Misses        880      880           

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