Needs more detail on its behavior

### Type of issue

Missing information

### Description

At time of writing the only information on ObjectPool.Get is Gets an object from the pool if one is available, otherwise creates one.

What if one isn't available?
Does it block?

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.objectpool.objectpool-1.get?view=net-8.0#microsoft-extensions-objectpool-objectpool-1-get

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/Microsoft.Extensions.ObjectPool/ObjectPool`1.xml

### Document Version Independent Id

905ccd94-8244-9c3e-d1eb-4e5d39858141

### Article author

@dotnet-bot