Translate docs/concepts/services-networking/endpoint-slices.md in Korea

[reung37]

This is a Feature Request

What would you like to be added
Translate docs/concepts/services-networking/endpoint-slices.md in Korean

Why is this needed
The following files are not translated into Korean.
/en/ docs/concepts/services-networking/endpoint-slices.md in Korean

Comments
Page to update : https://kubernetes.io/docs/concepts/services-networking/endpoint-slices/

I am working on translating this document.
This document translation will be submitted to the next branch(dev-1.16-ko.4).

/language ko

[sftim]

/priority backlog