[wasm] Update unrolling link in comment

Change-Id: I1289fcab6c4812868258b14492d85bad20ae7e9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3406536Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78755}

src/compiler/loop-unrolling.h

@@ -8,7 +8,7 @@
 // Loop unrolling is an optimization that copies the body of a loop and creates
 // a fresh loop, whose iteration corresponds to 2 or more iterations of the
 // initial loop. For a high-level description of the algorithm see
-// docs.google.com/document/d/1AsUCqslMUB6fLdnGq0ZoPk2kn50jIJAWAL77lKXXP5g/
+// https://bit.ly/3G0VdWW.
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/loop-analysis.h"