[embedder] Fix link in docs.

Change-Id: Id14ad85a7d32c021cf1616f01e6d78006ec80cd1
diff --git a/src/embedder/embedder_state.h b/src/embedder/embedder_state.h
index b06e726..4d4d627 100644
--- a/src/embedder/embedder_state.h
+++ b/src/embedder/embedder_state.h
@@ -86,7 +86,7 @@
   /// the cache ourselves when doing software rendering.
   ///
   /// TODO(akbiggs): Handle this. See
-  /// https://source.corp.google.com/github/flutter/engine/shell/platform/fuchsia/flutter/software_surface.cc;l=385
+  /// https://github.com/flutter/engine/blob/main/shell/platform/fuchsia/flutter/software_surface.cc#L385
   /// for an example.
   bool software_buffer_domain_needs_cache_clean = false;