Don't just refer to SCs by their number alone - #4947

For consistency:

* don't use a colon between the SC number and its title - my main reason
is that it looks somehow "stilted", and when used in a sentence it can
end up "fighting" with the punctuation of the actual sentence
(particularly when not part of a link), and just makes it harder to
parse
* don't just refer to SCs by number alone - (at least for first mentions
in a document) this helps documents be more readable without assuming
that the reader walks around remembering what each SC number is/what
criterion it actually represents.

It would be good to get something decided/officially mentioned in the
style guide (particularly for the use of `:` or not)

EDIT: normative changes split into #4947

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Co-authored-by: Kenneth G. Franqueiro <kfranqueiro@users.noreply.github.com>