Update docs to call out IPv6 support

[rshyamsu]

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[github-actions]

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[rshyamsu]

I have hereby read the F5 CLA and agree to its terms

[JTorreG]

Suggested change

	- {{% icon-feature %}} **NGINXaaS for Azure can now support IPv6**
	- {{% icon-feature %}} **NGINXaaS for Azure now supports IPv6**

[JTorreG]

approved with suggestions