Adjust language around the usage of receive in a gen_statem.
Adjust language around the usage of receive in a gen_statem.

- Change can not to should not and give a brief explanation of why
  one should not use a receive in a gen_* process.

dgud/otp,potatosalad/otp,dgud/otp,potatosalad/otp,vinoski/otp,dgud/otp,dgud/otp,vinoski/otp,erlang/otp,erlang/otp,potatosalad/otp,emacsmirror/erlang,vinoski/otp,vinoski/otp,emacsmirror/erlang,dgud/otp,bjorng/otp,emacsmirror/erlang,vinoski/otp,emacsmirror/erlang,dgud/otp,erlang/otp,erlang/otp,bjorng/otp,potatosalad/otp,vinoski/otp,erlang/otp,emacsmirror/erlang,bjorng/otp,potatosalad/otp,potatosalad/otp,bjorng/otp,potatosalad/otp,potatosalad/otp,emacsmirror/erlang,erlang/otp,bjorng/otp,potatosalad/otp,potatosalad/otp,dgud/otp,vinoski/otp,vinoski/otp,emacsmirror/erlang,erlang/otp,bjorng/otp,emacsmirror/erlang,dgud/otp,bjorng/otp,erlang/otp,bjorng/otp,dgud/otp,vinoski/otp,erlang/otp,vinoski/otp,bjorng/otp,emacsmirror/erlang,erlang/otp,emacsmirror/erlang,dgud/otp,bjorng/otp