Remove remaining uses of \times (3301) (issue 8509043)

[dak]

https://codereview.appspot.com/8509043/diff/1/Documentation/learning/fundamental.itely
File Documentation/learning/fundamental.itely (right):

https://codereview.appspot.com/8509043/diff/1/Documentation/learning/fundamental.itely#newcode502
Documentation/learning/fundamental.itely:502: between or across notes:
ties (marked by a tilde, @code{~}),
In either case, I'd rather use @dots{} instead of .. as its spacing is
better.  However, it looks like .. is used quite a bit more in this
section, so it might make sense to split this into a separate commit in
order not to drown out the \tuplet change itself.

https://codereview.appspot.com/8509043/