More changes based on Scott review

[kamaljit]

1. added a new article - managing azure subscriptions
2. updated TOC to include the above
3. updated - Get Started article: added managed disks example.

[acrolinx-at-msft2]

Acrolinx Scorecards

Click the scorecard links for each article to review the Acrolinx feedback on grammar, spelling, punctuation, writing style, and terminology:

Article	Score	Issues	Scorecard
docs-ref-conceptual/TOC.md	100	0	link
docs-ref-conceptual/get-started-with-az-cli2.md	83	29	link
docs-ref-conceptual/managing-azure-subscriptions.md	90	1	link

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[formulahendry]

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs-ref-conceptual/get-started-with-az-cli2.md	⚠️Warning	View	Details
docs-ref-conceptual/managing-azure-subscriptions.md	✅Succeeded	View

docs-ref-conceptual/get-started-with-az-cli2.md

• Line 155: [Warning] The content part of NOTE/WARNING/CAUTION/IMPORTANT syntax is suggested to start in a new line.

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