[scroll-animations-1] Editorial: precentage → percentage

Author: birtles

scroll-animations-1/Overview.bs

@@ -518,7 +518,7 @@ dictionary ElementBasedOffset {
     the {{orientation}} which the target should intersect with.
 
 :   <dfn dict-member for=ElementBasedOffset>threshold</dfn>
-::  A double in the range of [0.0, 1.0] that represent the precentage
+::  A double in the range of [0.0, 1.0] that represent the percentage
     of the target that is expected to be visible in  {{source}}'s [=scrollport=]
     at the intersection offset.