annotate docs/spec/track.tikz @ 673:e1f7cab30701

rename struct adbfoo to struct adb_foo

(or nearest idiomatic equivalent in the appropriate language)

This should have minimal impact on ABI compatibility, but is still formally
a backward-incompatible change (and is potentially an API incompatibility
too, though everyone should be using the typedefed synonyms.

\draw[thick] (-2.5,-0.2) rectangle (2.5,0.2);
\draw plot[domain=-2.4:2.4,samples=250] (\x, {0.15*sin(9.2*\x r)});