[whatwg/fetch] [render-blocking] The links of "render-blocking" in fetch are vague (Issue #1746)

### What is the issue with the Fetch Standard?

I found the links of "render-blocking" in fetch are vague when walking through the spec.
1. It shows "Possible linking syntaxes", when clicking https://fetch.spec.whatwg.org/#request-render-blocking 
2. The value of "render-blocking" of "fetch timing info" is not used anywhere. https://fetch.spec.whatwg.org/#fetch-timing-info-render-blocking
Should we make it clear?
@xiaochengh @emilio

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