doc: various minor edits - #17463

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Trott wants to merge 4 commits into

nodejs:masterfrom

Commits on Dec 5, 2017

doc: use colon consistently in assert.md
Trott
committed
92d2f2c
doc: improve punctuation in fs.open() text
Trott
committed
f363d91
doc: standardize preposition usage in fs.md
Trott
committed
48c477a
doc: edit module introduction
Trott
committed
69e7d3e