[ko] Fix wrong link in assign-pod-node.md

[claudiajkang]

This is a Bug Report

Problem: In scheduling-eviction/assign-pod-node korean page, there is worng link related to labels-annotations-taints.

Proposed Solution: Change link [잘 알려진 레이블, 어노테이션 및 테인트](/docs/reference/labels-annotations-taints/) to [잘 알려진 레이블, 어노테이션 및 테인트](/ko/docs/reference/labels-annotations-taints/) on assign-pod-node.md

Page to Update: https://kubernetes.io/ko/docs/concepts/scheduling-eviction/assign-pod-node

Note Set base branch Korean Team working branch!

Currently the working branch of Korean Team is dev-1.21-ko.7.

/language ko

[claudiajkang]

/triage accepted

[anushkamittal20]

/assign

[ShivamTyagi12345]

/assign