Delete stale comment warning about changing the prefix message sent b…

…y `BugReport` to the remote logging service.

"the crash watcher" was a Google-internal thing that was turned down in 2019Q4.

PiperOrigin-RevId: 445141068

src/main/java/com/google/devtools/build/lib/bugreport/BugReport.java

@@ -361,8 +361,6 @@ private static ImmutableList<String> filterArgs(Iterable<String> args) {
   // report being sent to a remote logging service.
   private static void logException(Throwable exception, List<String> args, String... values) {
     logger.atSevere().withCause(exception).log("Exception");
-    // The preamble is used in the crash watcher, so don't change it unless you know what you're
-    // doing.
     String preamble =
         getProductName()
             + (exception instanceof OutOfMemoryError ? " OOMError: " : " crashed with args: ");