Wrong using defer in example

[KolesnikDmitriy]

Describe the bug
Incorrect example with defer. Require my stops test execution when a test result fails, and defer stack will not fill.

To Reproduce
Steps to reproduce the behavior:
look through example:
https://github.com/ozontech/allure-go/blob/master/examples/suite_demo/setup_test.go#L92

Expected behavior
defer should executed right after context declaration

[siller174]

what is a main idea of this MR?

[KolesnikDmitriy]

The main idea is fix documentation to avoid confusion of newcomers. They may start using defer after t.Require

[koodeex]

In common case it make sense but in that example the reason why defer stay there is to highlight semantic of WithTearDown function

It looks like common sense to me that you need to put it in the begging of Test

Let me think day or two about that

[KolesnikDmitriy]

fixed in #78