Revert "docs(FileUploader): restore 'none' `buttonKind` knob (#1202)" (#1260)
Revert "docs(FileUploader): restore 'none' `buttonKind` knob (#1202)" (#1260)

This reverts commit 052822271c4663c153e25bd92f00ccb49e278153.
joshblack/carbon-components-react,carbon-design-system/carbon-components,carbon-design-system/carbon-components-react,joshblack/carbon-components-react,carbon-design-system/carbon-components-react,carbon-design-system/carbon-components,carbon-design-system/carbon-components