Added verbiage about infra-specific commands

[jaradtke-aws]

Issue #, if available: https://github.com/aws/eks-anywhere/issues/8517

Description of changes: Added verbiage about infra-specific commands capc-system vs capv-system (CloudStack vs vSphere - for example)

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.50%. Comparing base (ad1af14) to head (acaf1ff). Report is 373 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8518      +/-   ##
==========================================
- Coverage   73.50%   73.50%   -0.01%     
==========================================
  Files         578      578              
  Lines       36531    36531              
==========================================
- Hits        26853    26851       -2     
- Misses       7956     7957       +1     
- Partials     1722     1723       +1     

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