Minor documentation add

[tobiasBora]

Hello,

It is a minor documentation request, but it's not clear when you read it that it's possible to use (&&) and (||) operators like in

<:view< {t.name} | t in $table$; t.sex = "M" && (t.age >= 18 || t.parents_ok) >>

Would it be possible to add a little text about that ?

Thank you for your work !

[laheadle]

@tobiasBora - you could try a pull request; @gasche is very receptive to them.

[tobiasBora]

Ok thank you, I will do it in the next few days !