Add specific Processing headings + minor editorial (#1071)
This splits the “Link type "serviceworker"” ≫ “Processing” section into
two sections with separate headings:
* Processing the Link header
* Processing the link element
It also includes a minor editorial change to add the word “or” in a
place where lack of it makes the text ambiguous; this sentence:
> When a serviceworker link’s link element is inserted into a document,
> a serviceworker link is created on a link element that is already in a
> document tree, or the href or scope attributes of the link element of a
> serviceworker link is changed, the user agent should run these steps
...could be read as saying:
> When a serviceworker link’s link element is inserted into a document,
> **then** a serviceworker link is created on a link element...
When what it actually seems to mean is:
> When a serviceworker link’s link element is inserted into a document,
> **or** a serviceworker link is created on a link element...
That “or” is somewhat implied from the rest of the sentence, but this
this change just inserts an explicit “or” to make it more clear.