fix(request): extend error reasons based on missing values from spec

[Mickael-van-der-Beek]

As the title indicated, adds two allowed error codes that are specified in the Chrome Developer Tools Protocol specifications but missing from the Puppeteer enum:

https://chromedevtools.github.io/devtools-protocol/tot/Network#type-ErrorReason

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[Mickael-van-der-Beek]

@googlebot Signed it.

[googlebot]

CLAs look good, thanks!

[aslushnikov]

can you please update documentation for the request.abort method in docs/api.md:

https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#requestaborterrorcode

[Mickael-van-der-Beek]

@aslushnikov Sure. Done.

[aslushnikov]

Awesome, thanks!