Give a hint, when [] is incorrectly used for a composite type in array.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 510e1b8ecf2a6f0d91d50f41f6b7fd75242273a0
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2016-10-26T07:56:56Z
Releases: 10.0
Give a hint, when [] is incorrectly used for a composite type in array.

That used to be accepted, so let's try to give a hint to users on why
their PL/python functions no longer work.

Reviewed by Pavel Stehule.

Discussion: <CAH38_tmbqwaUyKs9yagyRra=SMaT45FPBxk1pmTYcM0TyXGG7Q@mail.gmail.com>

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