[whatwg/fetch] Clarification on step 4 of Headers `delete` method (#372)

Step 4 of `delete` states:
> 4. Otherwise, if guard is "request-no-cors" and name/`invalid` is not a CORS-safelisted request-header, return. 
I'm a little confused what `invalid` in this case is. 

Step 5 of `append` is similar to step 4 of `delete`, and it states:
> 5. Otherwise, if guard is "request-no-cors" and name/value is not a CORS-safelisted request-header, return. 

Is `invalid` in `delete`'s step 4 a place holder for a headers value? 


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