Update device-plugins.md (kubernetes#13849)

add link to Xilinx FPGA device plugin

content/en/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins.md

@@ -179,6 +179,7 @@ For examples of device plugin implementations, see:
 * The [AMD GPU device plugin](https://github.com/RadeonOpenCompute/k8s-device-plugin)
 * The [SRIOV Network device plugin](https://github.com/intel/sriov-network-device-plugin)
 * The [Intel device plugins](https://github.com/intel/intel-device-plugins-for-kubernetes) for GPU, FPGA and QuickAssist devices
+* The [Xilinx FPGA device plugins](https://github.com/Xilinx/FPGA_as_a_Service/tree/master/k8s-fpga-device-plugin/trunk) for Xilinx FPGA devices
 
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