LibCore: Use new global variables at /sys/kernel/ directory

Author: https://github.com/supercomputer7
Commit: c7dca00b65
Pull-request: https://github.com/SerenityOS/serenity/pull/15593
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Libraries/LibCore/ProcessStatisticsReader.h

@@ -34,7 +34,7 @@ struct ThreadStatistics {
 };
 
 struct ProcessStatistics {
-    // Keep this in sync with /proc/all.
+    // Keep this in sync with /sys/kernel/processes.
     // From the kernel side:
     pid_t pid;
     pid_t pgid;