doc: backport typo and grammar fixes to 9.0.x (from #14179)#14185

webknjaz merged 1 commit intopytest-dev:9.0.xpytest-dev/pytest:9.0.xfrom

him2him2:backport-14179-to-9.0.xhim2him2/pytest:backport-14179-to-9.0.xCopy head branch name to clipboard