bug#21742: 25.0.50; Document that ert-deftest expands all macros

[Lars Ingebrigtsen]

immerrr again <immerrr@gmail.com> writes:

> I started grepping and xref-ing through the code till I found that
> ert-deftest includes cl-macrolet which in turn runs macroexpand-all on
> the test definition.  Quite expectedly, it expands the define-arx macro
> that results in eval-and-compile which is also expanded and all that's
> left in the resulting test definition is a symbol.  More importantly,
> all side effects, i.e. function/macro definitions happen during test
> definition while they should really happen during test execution.

I've now added this to the doc string.

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