Fix PSAvoidLongLines Example

[Florian Heberl (floh96)]

PR Summary

In the example the parameter was not named correct.

PR Checklist

• [x ] PR has a meaningful title
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• [x ] Summarized changes
• [x ] Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
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[Rob Holt (rjmholt)]

Thomas Rayner (@thomasrayner) if you approve, I can merge

[Thomas Rayner (thomasrayner)]

Looks good to me!