Fix case to make lint happy

Author: inexorabletash

index.bs

@@ -8440,7 +8440,7 @@ NOTE: This is based on a definition in [[WEBIDL]] with these differences: 64-bit
 <div algorithm>
 A [=/list=] |A| is <dfn for=list>equal</dfn> to a [=/list=] |B| if |A|'s [=list/size=] equal's |B|'s [=list/size=] and each [=list/item=] in |A| is equal to the [=list/item=] at the same index in |B|.
 
-Issue(whatwg/infra#664): Remove this when a definition in [[Infra]] is available.
+Issue(whatwg/infra#664): Remove this when a definition in [[INFRA]] is available.
 </div>