system.IO.ports 9.0.2 not support serial port

### Type of issue

Typo

### Description

system.IO.ports 9.0.2 not support serial port

can’t find serialPort = new SerialPort();

此處輸入意見反映]

### Page URL

https://learn.microsoft.com/zh-hk/dotnet/api/system.io.ports?view=net-9.0-pp

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/ns-System.IO.Ports.xml

### Document Version Independent Id

24dce530-c03d-0469-f9a5-58268fa97be9

### Article author

@dotnet-bot