Edits to README for standalone installer

[jmgrady]

This PR fixes some errors to the README.md file for the installer script:

1. Provided missing example to show how to view the current expiration date for The Combine's web certificate; and
2. changed release numbers in examples to actual release numbers.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.25%. Comparing base (551e086) to head (445a02b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3055      +/-   ##
==========================================
- Coverage   74.29%   74.25%   -0.04%     
==========================================
  Files         269      269              
  Lines       10323    10323              
  Branches     1217     1217              
==========================================
- Hits         7669     7665       -4     
- Misses       2303     2306       +3     
- Partials      351      352       +1     

Flag	Coverage Δ
backend	82.84% <ø> (-0.09%)	⬇️
frontend	66.31% <ø> (ø)

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[imnasnainaec]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jmgrady)