TAB gives me help about Python etc functions but not about ones

good day,
Im using Google colab,
problem is using TAB gives me help about python functions, all good,
but when I use it with a function it doesnt work, nothing happens when I do it inside a function

and there are even some functions like

which return error when using ?

Object random_split_by_pct not found.

ok in that case I needed to do

and then it works

but basically using

?.. in a separate cell is the only way I find,
the TAB never works for me with functions, only for autocompleting, not for help

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