Document for wrangler functions, including datetime, geo, number, etc.

Description

There are multiple functions we support in wrangler https://github.com/data-integrations/wrangler/tree/develop/wrangler-docs/functions, we should have better documentation to expose them to customers.

Release Notes

None
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Assignee

Trishka Fernandes

Reporter

Yaojie Feng

Docs Impact

Yes