[lldb] Replace another inconsequential radar link (NFC)

The existing comment already explains what the problem is. The radar
tracks caching negative lookups in xcrun. Having a backlink is handy,
but it's not necessary as the radar references the LLDB workaround.
Furthermore, we have other places in LLDB that work around xcrun not
caching negative that should potentially be reconsidered at that time.

Author: JDevlieghere

lldb/source/Plugins/Platform/MacOSX/PlatformAppleSimulator.cpp

@@ -545,7 +545,7 @@ static bool shouldSkipSimulatorPlatform(bool force, const ArchSpec *arch) {
   // If the arch is known not to specify a simulator environment, skip creating
   // the simulator platform (we can create it later if there's a matching arch).
   // This avoids very slow xcrun queries for non-simulator archs (the slowness
-  // is due to xcrun not caching negative queries (rdar://74882205)).
+  // is due to xcrun not caching negative queries.
   return !force && arch && arch->IsValid() &&
          !arch->TripleEnvironmentWasSpecified();
 }