feat: docs & ARCH 2.2, 2.3, 2.4

kernel/src/mem/pm_manages.rs

@@ -279,7 +279,7 @@ impl PMActor {
             root_untyped: root_cap,
             managed_range: (start, PhysAddr(start.0 + total_pages as u64 * PAGE_SIZE)),
             queue: PMActorQueue::new(),
-            buddy: BuddyAllocator::new(total_pages),
+            buddy: BuddyAllocator::new(total_pages, start.0),
         }
     }