Fix another singleton variable in the marked-source example.
The singleton check did its job here -- we had a typo in the evar.
@@ -254,6 +254,6 @@ $$C++$$ variable:
//- VXSpaceBox.pre_text " "
//- VXRoot child.2 VXIdentifier
//- VXIdentifier.kind "IDENTIFIER"
-//- VXIdenfifier.pre_text x
+//- VXIdentifier.pre_text x
int x;
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