docs(config): document the flavour key

colitur.1 documented the flag and colitur-config(5) documented every
[defaults] key except this one, which the previous commit added.

Says what a flavour IS rather than only listing the values: the set of
characters that must be neutered so a value cannot corrupt its target.
A semicolon is ordinary text in LaTeX and a field separator in
iCalendar; an unescaped & or _ does not look wrong in LaTeX, it aborts
the build. Also why unset means INFER rather than 'no escaping', and why
there is no silent fallback.

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