Add descriptor reference documentation
Add descriptor reference documentation

Github-Pull: #14096
Rebased-From: 9254ffcf2d910ecb0f9ecbeef6d40a2008a44870
Tree-SHA512: 1fc466177dbe3b57b0025c102b1e75e4b05544440819885da7a85b70d20329fc3f6f4cbf89d7d6a48881e6ad176d81f7396f02925586140e19468a2f28f3414e

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