11433: minor: Add scary warning to `onEnter` r=lnicola a=lnicola
Closes #11432
Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
//
// This action needs to be assigned to shortcut explicitly.
//
+// Note that, depending on the other installed extensions, this feature can visibly slow down typing.
+// Similarly, if rust-analyzer crashes or stops responding, `Enter` might not work.
+// In that case, you can still press `Shift-Enter` to insert a newline.
+//
// VS Code::
//
// Add the following to `keybindings.json`: