Re: [fetch] Clarify main fetch recursive invocation from redirect-fetch#217 (#218)

> @@ -1877,7 +1882,7 @@ <h3 id="main-fetch"><span class="secno">5.1 </span>Main fetch</h3>
>   <!-- Per Mike West HSTS happens "probably after" Referrer -->
>  
>   <li><p>If <var>request</var>'s <a href="#synchronous-flag">synchronous flag</a> is unset and
> - <a href="#concept-main-fetch" title="concept-main-fetch">main fetch</a> is not invoked recursively, run the
> + <a href="#recursive-flag">recursive flag</a> is unset, run the

This should just use `<i>`. Same below.

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