Document AccessKeyId from UserInfo

[ryanmt]

Include AccessKeyId in the documentation of the full configuration to
make it more discoverable.

Related to the work in #286

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[ryanmt]

/assign @wongma7

I've also signed the CLA.

[ryanmt]

I signed it

[ryanmt]

I signed it

[ryanmt]

I signed it

[pjbgf]

thanks for the contribution @ryanmt

/lgtm

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[micahhausler]

/approve
/lgtm

Thank you!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: micahhausler, pjbgf, ryanmt

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