Update git bisect in Module 04.11

[oC-n]

git bisect end is no longer valid. Now git bisect reset seems to fulfil this role, with the option of checking out a specific commit. I'm not familiar with how git bisect end behaved, so not sure what the exact equivalent is in the current version of git.

May be good to add that the git bisect reset command can be used to check out the problem commit, as well as returning to the previous HEAD by default.