Updates docs to help NuGet users

[DaleMckeown]

Helps point NuGet users to the right syntax for ignoring versions - more info: dependabot/dependabot-core#6873

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@DaleMckeown Thanks so much for opening a PR! I'll get this triaged for review ⚡

[jeffwidman]

@cmwilson21 Approving the logic change on behalf of the core team. Feel free to slack me if questions.

[felicitymay]

@DaleMckeown - many thanks for turning your Dependabot question into an improvement in the docs to help other users 💖

This has had an SME 👍🏻 and looks fine from a content point of view. It looks ready to merge 🚀

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