chore: fix comment

Signed-off-by: hanghuge <[email protected]>

Author: hanghuge

src/templates/assets/javascripts/integrations/instant/index.ts

@@ -378,7 +378,7 @@ export function setupInstantNavigation(
 
     // Handle instant navigation events that are triggered by the user clicking
     // on an anchor link with the same hash fragment as the current one in the
-    // URL. Is is essential that we only intercept those from instant navigation
+    // URL. It is essential that we only intercept those from instant navigation
     // events and not from history change events, or we'll end up in and endless
     // loop. The top-level history entry must be removed, as it will be replaced
     // with a new one, which would otherwise lead to a duplicate entry.