doc: document readline keybindings#20825

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shobhitchittora wants to merge 7 commits intonodejs:masterfrom

shobhitchittora:doc-tty-keybindings

Commits on May 18, 2018

doc: adds handeled tty write keybindings
shobhitchittora
committed

Commits on May 21, 2018

doc: add the keybindings to readline doc. Also -
shobhitchittora
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Commits on May 24, 2018

Commits on May 26, 2018

doc: adds description for ctrl+z
shobhitchittora
committed

Commits on May 27, 2018

doc: fixes line warnings + removes nbsp;
shobhitchittora
committed