System.Diagnostics.PerformanceCounterType.NumberOfItems32 got wrong description

[WenceyWang]

https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.performancecountertype?view=net-5.0 shows NumberOfItems32:

An instantaneous counter that shows the most recently observed value. Used, for example, to maintain a simple count of items or operations. Counters of this type include Memory\Available Bytes.

which is not true, In my test:

> (new PerformanceCounter("Memory", "Available Bytes", true)).CounterType
NumberOfItems64

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

Tagging subscribers to this area: @tommcdon, @krwq
See info in area-owners.md if you want to be subscribed.

Issue Details

---

https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.performancecountertype?view=net-5.0 shows NumberOfItems32:

An instantaneous counter that shows the most recently observed value. Used, for example, to maintain a simple count of items or operations. Counters of this type include Memory\Available Bytes.

which is not true, In my test:

> (new PerformanceCounter("Memory", "Available Bytes", true)).CounterType
NumberOfItems64

Author:	WenceyWang
Assignees:	-
Labels:	:watch: Not Triaged, Pri3, area-System.Diagnostics
Milestone:	-