Remove unnecessary platform information about Cobalt

See b/169093796 for details

Change-Id: Icdb6fac9d3063cc0dedd68e318805b88f4c06bc6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2421982
Auto-Submit: John Xu <johnx@google.com>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70040}

src/base/platform/platform-starboard.cc

@@ -4,8 +4,7 @@
 
 // Platform-specific code for Starboard goes here. Starboard is the platform
 // abstraction layer for Cobalt, an HTML5 container used mainly by YouTube
-// LivingRoom products. Starboard was ported to platforms like PlayStations,
-// AndroidTV, AppleTV, Samsung smart TVs and so on.
+// apps in the livingroom.
 
 #include "src/base/lazy-instance.h"
 #include "src/base/macros.h"