Add docs for Literal types#6150

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Michael0x2a merged 5 commits intopython:masterfrom

Michael0x2a:add-docs-for-literal

Jan 10, 2019

Commits on Jan 6, 2019

Commits on Jan 7, 2019

Respond to Ivan's code review
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Commits on Jan 10, 2019

Respond to final wave of code review
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