PR Summary

Two changelog tweaks:

• one to fix an incorrect line about Select-String in 7.0-preview.5
• one to reword a confusing sentence about Import-DscResource

PR Context

The changelog incorrectly stated that Select-String got an -Emphasis parameter, when in fact emphasis is default and a -NoEmphasis param was added.

Also, Steve Lee (@SteveL-MSFT) had been pinged about a confusing line about Import-DscResource, so I went ahead and reworded it as well.

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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