Re: [fetch] The empty string is rejected as header values (#115)

> `*field-content`

Probably.

Mentioning that `*field-content` is equal to
```
a byte sequence that matches the field-value token production and contains no 0x0A or 0x0D bytes.
```
(the previous definition of header value, if we interpret them using RFC 7230) or "`*field-value` with `*obs-fold` disallowed" might help readers to understand why `*field-content` is used here.

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