🍄SpecBlocksHeading

Heading introduces a new section. Headings go to the table of contents.

Heading ::=
   (Heading1
  | Heading2
  | Heading3
  | Heading4) NL
Heading1 ::= "=" LWS FormattedLine
Heading2 ::= "==" LWS FormattedLine
Heading3 ::= "===" LWS FormattedLine
Heading4 ::= "====" LWS FormattedLine