Update fixtures.py
Update fixtures.py

Corrected "or or" typo in docstring (and made indentation consistent).
The-Compiler/pytest,tareqalayan/pytest,davidszotten/pytest,markshao/pytest,flub/pytest,MichaelAquilina/pytest,ddboline/pytest,tomviner/pytest,pfctdayelise/pytest,rmfitzpatrick/pytest,tomviner/pytest,alfredodeza/pytest,The-Compiler/pytest,hackebrot/pytest,nicoddemus/pytest,tgoodlet/pytest,nicoddemus/pytest,RonnyPfannschmidt/pytest,jaraco/pytest,txomon/pytest,Akasurde/pytest,pytest-dev/pytest