typo

src/vmod_tus.vcc

@@ -55,7 +55,7 @@ CORS
 The `xserver.synth()`_ and `xserver.deliver()`_ methods will set the
 right CORS headers allowing all Origins, that is,
 ``Access-Control-Allow-Origin`` set to ``Origin``. As any other
-header, the CORS headers can be changes after the call to
+header, the CORS headers can be changed after the call to
 `xserver.synth()`_, and should be to restrict Origin access.
 
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