Review doctest docs (#5183)
Review doctest docs (#5183)

Review doctest docs
Akasurde/pytest,nicoddemus/pytest,tomviner/pytest,markshao/pytest,alfredodeza/pytest,tomviner/pytest,RonnyPfannschmidt/pytest,pytest-dev/pytest,The-Compiler/pytest,The-Compiler/pytest,nicoddemus/pytest