[Doc] Update Injecting HTML guide

keyCode is deprecated, method in doc doesn't work
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode

Updating with "modern" method
key:'Enter'
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nanogyth 2022-03-27 08:47:47 -04:00 committed by GitHub
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@ -21,7 +21,7 @@ To automatically enter commands in the terminal (only works if looking at the te
terminalInput[handler].onChange({target:terminalInput});
// Simulate an enter press
terminalInput[handler].onKeyDown({keyCode:13,preventDefault:()=>null});
terminalInput[handler].onKeyDown({key:'Enter',preventDefault:()=>null});
To add lines to the terminal (only works if looking at the terminal):