Fix typo in ephemeral storage key for Karpenter

[Sebastian-Materna]

Fix Azure/AKS#5471

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Pull request overview

This PR fixes a typo in the Karpenter ephemeral storage key name in the AKS node auto-provisioning documentation. The key was incorrectly documented as karpenter.azure.com/sku-storage-ephemeral-os-maxsize with a hyphen between "ephemeral" and "os", when the correct format is karpenter.azure.com/sku-storage-ephemeralos-maxsize without the hyphen.

• Corrected the ephemeral storage key from ephemeral-os-maxsize to ephemeralos-maxsize

[ttorble]

@schaffererin

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