Adding migration guide for 3.0.0 release.

[twitchax]

Comments

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Overall Changes

N/A.

General

• Title of the PR is clear and informative
• There are a small number of commits that each have an informative message

Tests

N/A.

Cmdlet Signature

N/A.

Parameters

N/A.

Parameters and the Pipeline

N/A.

[azurecla]

Hi @twitchax, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

It looks like you're working at Microsoft (aaroney). If you're full-time, we DON'T require a contribution license agreement.

If you are a vendor, DO please sign the electronic contribution license agreement. It will take 2 minutes and there's no faxing! https://cla.azure.com.

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[azuresdkci]

Can one of the admins verify this patch?

[cormacpayne]

@azuresdkci add to whitelist

[cormacpayne]

LGTM