Fix spell error

Fix an error of spelling

Author: jihyerish

index.bs

@@ -1394,7 +1394,7 @@ To <dfn lt="directionally scroll an element | directionally scroll the element">
 
 The editors of this specification would like to thank the following individuals for their feedback and contributions (in alphabetical order):
 * Alice Boxhall
-* Brial Kardell
+* Brian Kardell
 * Elika Etemad
 * Hugo Holgersson
 * Hyojin Song