Update index.bs

Co-authored-by: Darien Maillet Valentine <valentinium@gmail.com>

Author: Ms2ger

index.bs

@@ -72,7 +72,7 @@ urlPrefix: https://tc39.es/ecma262/; spec: ecmascript
 urlPrefix: https://tc39.es/proposal-resizablearraybuffer/; spec: RESIZABLE-BUFFERS-PROPOSAL
     type: abstract-op
         text: IsResizableArrayBuffer; url: sec-isresizablearraybuffer
-urlPrefix: https://tc39.es/proposal-async-context/; spec: RESIZABLE-BUFFERS-PROPOSAL
+urlPrefix: https://tc39.es/proposal-async-context/; spec: ASYNC-CONTEXT-PROPOSAL
     type: abstract-op
         text: AsyncContextSnapshot; url: sec-asynccontextsnapshot
         text: AsyncContextSwap; url: sec-asynccontextswap