editorial: remove trailing whitespace (#607)

Author: Thiago Perrotta

index.bs

@@ -9630,7 +9630,7 @@ end:
 </div>
 ## Console ##  {#patches-console}
 
-Other specifications can define <dfn>console steps</dfn>. 
+Other specifications can define <dfn>console steps</dfn>.
 
 1. At the point when the [=Printer=] operation is called with
    arguments |name|, |printerArgs| and |options| (which is undefined if the