Re: [jlreq] name of levels on headings (#120)

there seems 34 'level heading' in total, will change following. Also there is some use as:
> one of the headings between the top and third levels is used

- 1 first -> top
- 1 the highest (in https://w3c.github.io/jlreq/#n42), should be fine to be kept?
- 2 second (in https://w3c.github.io/jlreq/#n42 and glossary), first one should be fine to be kept?; -> medium
- 1 higher (in ), -> upper? (also `smaller size headings` need to be `lower level headings`)
- 2 thrid -> low

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