Editorial: Properly format enum strings

[a-sully]

Before: {{WriteCommandType/"write"}}
After: "{{WriteCommandType/write}}"

Fixes #133

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[a-sully]

Question: should strings like "readwrite" be converted to "{{FileSystemPermissionMode/readwrite}}"? Presumably that would require moving the declaration of FileSystemPermissionMode to this spec, though. Not sure if that's something we want to do

[inexorabletash]

I defer to Anne of course, but if they're internal state not enum members, then I'd keep them as strings. I'd use https://fetch.spec.whatwg.org/#fetch-controller-state as an analogue.

[annevk]

Thanks, I agree with @inexorabletash. We do want to format strings the same way as enums, but I think we're doing that already.