build: strip trailing whitespace in docs

[miniak]

Description of Change

Trailing whitespace is evil. Added npm run lint:check-trailing-whitespace linter step.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR title follows semantic commit guidelines

Release Notes

Notes: no-notes

[MarshallOfSound]

Is there any way we can add linting for this in our lint.js script. I agree whitespace like this just annoys me 😆

[MarshallOfSound]

Meant to approve

[miniak]

@MarshallOfSound added npm run lint:check-trailing-whitespace, which is part of npm run lint:docs

[miniak]

it works! :)

> electron@6.0.0-nightly.20190311 lint:check-trailing-whitespace /home/builduser/project/src/electron
> python ./script/check-trailing-whitespace.py

Parsed through 182 files within docs directory and its 6 subdirectories.
Found 0 files with trailing whitespace.

[miniak]

should have been updated in docs: process.getProcessMemoryInfo() returns a Promise

[ppontes]

Awesome.

[release-clerk]

No Release Notes