Documentation Issue: ConditionalWeakTable<TKey,TValue> Class

### Type of issue

Code doesn't work

### Description

1) The provided C# example fails to compile due to a conversion error. Example fixes:
A) Replace `cwt.TryGetValue(wr2.Target, out data)` with `cwt.TryGetValue((ManagedClass)wr2.Target, out data)`
B) Replace `var cwt = new ConditionalWeakTable();` with `var cwt = new ConditionalWeakTable();`

2) Possibly it's worth adding a note that the example may fail to function in debug mode, since in-scope variables are ineligible for collection during debug.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.conditionalweaktable-2?view=net-8.0&redirectedfrom=MSDN

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Runtime.CompilerServices/ConditionalWeakTable`2.xml

### Document Version Independent Id

6a9b0e31-d0a6-c930-7959-20ac6f03ec4a

### Article author

@dotnet-bot