add comments

src/Ryujinx.Memory/Tracking/MemoryTracking.cs

@@ -299,6 +299,7 @@ namespace Ryujinx.Memory.Tracking
                 NonOverlappingRangeList<VirtualRegion> regions = guest ? _guestVirtualRegions : _virtualRegions;
                 ref RangeItem<VirtualRegion>[] overlaps = ref ThreadStaticArray<RangeItem<VirtualRegion>>.Get();
                 
+                // We use the non-span method here because keeping the lock will cause a deadlock.
                 regions.Lock.EnterReadLock();
                 OverlapResult result = regions.FindOverlapsNonOverlapping(address, size, ref overlaps);
                 regions.Lock.ExitReadLock();