fixed inaccurate variable descriptions for azure cni in overlay mode

[Xelef2000]

Describe your changes

The current description for the variable net_profile_pod_cidr is inaccurate since it states that this field can only be set when network_plugin is set to kubenet, but it can (and probably will) be used with the azure cni in overlay mode.

The variable description for network_plugin_mode states, that the only possible value is 'Overlay', which works, but the API will change it to lowercase 'overlay', terraform will attempt to change this to uppercase 'Overlay' during every subsequent apply, according to my testing.

Issue number

000

Checklist before requesting a review

• [x] The pr title can be used to describe what this pr did in CHANGELOG.md file
• [x] I have executed pre-commit on my machine
• [x] I have passed pr-check on my machine

Thanks for your cooperation!

[Xelef2000]

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