v2.8.1 to fix W6100 speed display bug

### Releases v2.8.1

1. Fix minor `speed-link-duplex` bug for `WIZNet W6100`

Author: khoih-prog

README.md

@@ -2668,7 +2668,7 @@ String Len = 23722
 
 #### 23. WebClient_ESP on ESP32_DEV with W6100 using Ethernet_Generic Library on SPI
 
-The following are debug terminal output when running example [UdpNTPClient](examples/UdpNTPClient) on Curiosity `AVR_AVR128DA48` with `W5100` using Ethernet_Generic Library
+The following are debug terminal output when running example [UdpNTPClient](examples/UdpNTPClient) on Curiosity `AVR_AVR128DA48` with `W6100` using Ethernet_Generic Library
 
 ```
 Starting WebClient_ESP on ESP32_DEV with W5x00 using Ethernet_Generic Library on SPI