fix: Add documentation to folder resource (box/box-openapi#421)

[coveralls]

Pull Request Test Coverage Report for Build 9019198985

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 89.361%

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Files with Coverage Reduction	New Missed Lines	%
box_sdk_gen/internal/base_object.py	2	83.93%
<!--	Total:	2		-->

Totals
Change from base Build 9019170139:	-0.02%
Covered Lines:	8609
Relevant Lines:	9634

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💛 - Coveralls