documentation: update documentation following node-sass-chokidar updates

[eMerzh]

Hi,

since first node-sass-chokidar 1.1.0 , the watch command also do an initial compile (unless you ask it not to ;) )

so i've update the doc accordingly

Ref: https://github.com/michaelwayman/node-sass-chokidar/blob/master/CHANGELOG.md#110

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[iansu]

There's an existing PR that covers this (although it's against master instead of next): #4205

[eMerzh]

oh 😀 ok.. didn't saw it 🤔 ...
i close this down :)