Extract headings from www.rfc-editor.org RFCs #1883
Merged
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Via mdn/browser-compat-data#23958 (review).
RFCs published at www.rfc-editor.org use spans to define headings. This update creates custom logic to deal with these, while attempting to restrict the pattern as much as practical, in case another spec suddenly introduces class names such as
h2
attached to spans.