Document % in mininotation

[jqueraltmo]

"In mininotation, % denotes a ratio (/ manipulates time)" https://club.tidalcycles.org/t/fractions-variables-etc-in-mininotation/3419/2

% only appears in the mininotation page when dealing with polymetric sequences. It should be added as a symbol in its own.

[madamsapple]

This is done! https://tidalcycles.org/docs/reference/mini_notation#ratio-shorthand