Adds OFS to AboutStrings

[indented-automation]

PR Summary

Adds a short section about OFS

Context

Updates AboutStrings.Koans.ps1

Changes

• Adds Arrays and Strings

Checklist

• Pull Request has a meaningful title.
• Summarised changes.
• Pull Request is ready to merge & is not WIP.
• Added tests / only testable interactively.
  • Make sure you add a new test if old tests do not effectively test the code changed.
• Added documentation / opened issue to track adding documentation at a later date.

[vexx32]

Thanks for this! 😄

Couple comments, mostly trying to make sure wording isn't too confusing.

Also, thought I'd point out that we're trying to move towards the __ | Should -Be $ExpectedValue format as that's both a bit easier to parse looking at the files, and also tends to give more sensible errors from the pester tests, so the Measure-Karma output looks more sensible.

[vexx32]

Looks good, thanks! 😄