Fix typo in key binding manager docs (#8221)
Fix typo in key binding manager docs (#8221)

I found a Typo error in KeyBindingManager, I have fixed that typo.
matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk