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in hardcoded_resource doc, don't imply its only useful in tests

Description

in hardcoded_resource doc, don't imply its only useful in tests

Summary: A user thought the doc meant they shouldn't use it in production.

Test Plan: bk

Reviewers: yuhan, cdecarolis

Reviewed By: yuhan

Differential Revision: https://dagster.phacility.com/D8445