Correct reference to Azure access keys vs Azure shared keys

[artisticcheese]

There is no concept of "Shared Keys" in Azure, there is Shared Access Signatures and there are Access Keys. Current version of Azure blob output is relying on Access Keys (which is essentially root keys and referring to them as shared keys just confuses users since they would think those are Shared Access Signatures

[edsiper]

@artisticcheese thanks for your contribution.

In order to merge it, would you please sign-off your commit with -s so DCO error will pass ?

[artisticcheese]

I don't know what that means. What sign-off with -s means

[lecaros]

Hi @artisticcheese, please refer to https://github.com/fluent/fluent-bit-docs/blob/master/CONTRIBUTING.md#sign-off-your-commits for details on signing-off.

[github-actions[bot]]

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