Corrected interactive rebase keybind example in README.md (#4426)

- **PR Description**
* The keybind for moving a commit up in the interactive rebase example
of the README file is incorrect.
I've changed it to the keybind present in current versions of Lazygit

Author: stefanhaller

Diff for: README.md

@@ -126,7 +126,7 @@ Press space on the selected line to stage it, or press `v` to start selecting a
 
 ### Interactive Rebase
 
-Press `i` to start an interactive rebase. Then squash (`s`), fixup (`f`), drop (`d`), edit (`e`), move up (`ctrl+i`) or move down (`ctrl+j`) any of TODO commits, before continuing the rebase by bringing up the rebase options menu with `m` and then selecting `continue`.
+Press `i` to start an interactive rebase. Then squash (`s`), fixup (`f`), drop (`d`), edit (`e`), move up (`ctrl+k`) or move down (`ctrl+j`) any of TODO commits, before continuing the rebase by bringing up the rebase options menu with `m` and then selecting `continue`.
 
 You can also perform any these actions as a once-off (e.g. pressing `s` on a commit to squash it) without explicitly starting a rebase.