<docs>(concepts): change data types to upper case because lower case …

[david30907d]

…would fail when you want to apply this FeatureSet

I'm not sure this PR is appropriate or not, but the data types on README would fail when i'm trying to create my own FeatureSet. I'm thinking about maybe putting the real data types on doc?

[feast-ci-bot]

Hi @david30907d. Thanks for your PR.

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[zhilingc]

Thanks for updating the docs!

[zhilingc]

/lgtm

[zhilingc]

/retest

[zhilingc]

/approve

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: david30907d, zhilingc

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