funny "usage" lines in secuTrialdata.Rd

[gillesdutilh]

There are two funny lines in the "usage" of secuTrialdata.Rd:

print(x)
plot(x)

[PatrickRWright]

hey @gillesdutilh

These lines come from the generic print() and plot() methods for the secuTrialdata object.

The relevant lines are this and this.

[PatrickRWright]

I wonder if we should remove the generic plot() since we are not exporting it anyway. For the print() we should maybe change the x to something more descriptive.

[gillesdutilh]

If print just works without further arguments, you do not need to describe in the help. You could add both generic function descriptions under "see also".