Add SSD embedding APIs in documentation

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Differential Revision: D60356701

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This pull request was exported from Phabricator. Differential Revision: D60356701

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This pull request was exported from Phabricator. Differential Revision: D60356701

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This pull request was exported from Phabricator. Differential Revision: D60356701

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This pull request was exported from Phabricator. Differential Revision: D60356701

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This pull request was exported from Phabricator. Differential Revision: D60356701

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This pull request has been merged in pytorch/FBGEMM@746e96dc9bd299e04e4ac91483557d87ac5219cc.