Per official docs, the binding for ‘Show Hover’ is:
⌘K ⌘I
Remember that ⌘K is a ‘chord’, so do that first (Code will show “⌘K was pressed. Waiting for second key of chord…“), and then ⌘I.
Hope this helps. It’s not the most elegant of bindings, but nothing to stop you changing it!
Note:-
For VSCodeVim users, this is: gh.
For Windows users, this is: Ctrl + K Ctrl + I