iif implementation doesn't support 1 or 2 parameter

[ChristopherHX]

Adjust docs to match implementation assuming this is not autogenerated

steps:
- ${{ if iif(False, False) }}:
  - bash: ok

is a syntax error for the validate pipeline feature

After I saw the documentation, I thought that 1 or 2 parameters are valid as well and no it didn't work

[prmerger-automator[bot]]

@ChristopherHX : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Court72]

@juliakm

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[ktoliver]

@juliakm - Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!