Adjust `git reset --hard` in Git cheat sheet

[arxanas]

Closes #150

[arxanas]

By the way, I couldn't figure out how to get sl pr to work, so I submitted this manually 😦.

 ~/Workspace/sapling $  sl                                                                                             ◉
@  42e8d98a8  19 minutes ago  me  git-cheat-sheet* remote/git-cheat-sheet
╷  Adjust Git cheet sheet `git reset --hard` equivalence
╷
o  fe5ab6dcf  Today at 14:24  remote/main
│
~
 ~/Workspace/sapling $  sl pr                                                                                          ◉
no commits to submit

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