doc: note about mutation of parametrized values (#7516)
doc: note about mutation of parametrized values (#7516)

Fix #7514 by augmenting Note with behaviour when parametrized values are mutated
(changes are reflected in subsequent test-case calls).
nicoddemus/pytest,pytest-dev/pytest,nicoddemus/pytest,RonnyPfannschmidt/pytest,markshao/pytest,The-Compiler/pytest,The-Compiler/pytest,Akasurde/pytest