Incomplete info on terminating hairpins in documentation

[Bas Ammerlaan]

Hello everyone,

Regarding the termination of hairpins (cresc. & decresc.): I was
transcribing a piece of music and could't figure out why my hairpin would
terminate to the right of the previous note instead of the note I attached
"\!" to. Turns out it was because Lilypond tries to prevent ending hairpins
on a downbeat.

Apparently this is intended behaviour (though I mostly find it annoying),
but it makes the information provided here faulty:
http://lilypond.org/doc/v2.18/Documentation/notation/expressive-marks-attached-to-notes#dynamics

The sentence "A hairpin that is terminated with \! will end at the right
edge of the note that has the \! assigned to it." is false or at best
incomplete: the condition of the downbeat is not mentioned until the
"Selected snippets" much lower on the page. This caused me to search around
for half an hour to find out why my hairpin was not ending where I wanted
it, since I didn't expect this information to be under "Selected snippets".

Best,

Bas.