Add documentation for words related to string and numeric literals#12

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alyonakova wants to merge 4 commits intosayon:developfrom alyonakova:documentation

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Commits on Sep 30, 2018

Document words that read digits
Alyona Kovalyova
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Document words that read string literals
Alyona Kovalyova
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Document words that read numeric literals
Alyona Kovalyova
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Document words that define flags for sys-open
Alyona Kovalyova
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