Fixed spelling of attribute

Author: KristofferStrube

index.bs

@@ -7337,7 +7337,7 @@ Attributes</h4>
     ::
         Controls whether the impulse response from the buffer will be
         scaled by an equal-power normalization when the
-        {{ConvolverNode/buffer}} atttribute is set. Its default value is
+        {{ConvolverNode/buffer}} attribute is set. Its default value is
         `true` in order to achieve a more uniform output
         level from the convolver when loaded with diverse impulse
         responses. If {{normalize}} is set to