[erlang-questions] Questions about Erlang documentation

[Kirill Zaborski]

Investigating Erlang official documents I see a moment which I do not
understand:
In a lot of chapters I see something like "gen_server(3)" mentioned (That's
from
http://www.erlang.org/doc/doc-5.5.1/doc/design_principles/gen_server.html ).
The first thought was about functions and their arity, but that's not a
function of course. So what exactly is this?
And one more question: I occasionally find misprints in docs - Is there any
email where I should send information about them?

BR,
Kirill.
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