Azure provider doc refresh

[darkn3rd]

Description

This is an update of Azure to align it to current AKS (Kubernetes v1.22+) and document current features, such as support for AAD Pod Identities.

Updated sections with changes for consistency and readibility, such as:

• use long --form for options in documentation, rather than short -f form, as self documenting flags are preferred for documentation.
• document default namespace in case users may want to put ExternalDNS into a separate namespace like external-dns or kube-addons
• Azure DNS group is now consistently called MyDnsResourceGroup
• Update Azure doc links to multilingual URLs, not just US English (en-us) links

Fixes #2743
Fixes #2744
Fixes #2742

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: darkn3rd / name: Joaquin Menchaca (2eb88c2)

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[darkn3rd]

@Raffo @seanmalloy Any chance to get this reviewed and merged?

[njuettner]

/lgtm

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