docs: Clarifying use of --metrics and epss options

[Mayankrai449]

• resolves docs: Clarify use of --metrics and epss options #3625

• Added documentation clarifying automatic activation of --metrics.
• Updated epss related help

[Mayankrai449]

@terriko Can you please provide a feedback, so I can further improve my documentation work.

[terriko]

A few changes to make this shorter and clearer. Note that I updated your branch to address a test issue, so you should be able to get to the point where all tests pass and this can be merged if you keep the updated branch!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bf9afe9) 78.98% compared to head (ed97c4c) 79.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3663      +/-   ##
==========================================
+ Coverage   78.98%   79.42%   +0.44%     
==========================================
  Files         797      797              
  Lines       11927    11927              
  Branches     1602     1602              
==========================================
+ Hits         9420     9473      +53     
+ Misses       2075     2022      -53     
  Partials      432      432              

Flag	Coverage Δ
longtests	78.73% <ø> (+0.42%)	⬆️
win-longtests	77.24% <ø> (+0.39%)	⬆️

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[Mayankrai449]

@terriko committed the requested changes with updated branch. 👍

[terriko]

Looking good now. I'm going to update the branch again to try to fix the tests so this can be merged, but you might have to wait until tomorrow since I'm at the end of my work day!

[terriko]

Looks like we're set to merge now. Thank you for both the PR and your patience with our test failures!