Merge pull request #17997 from sftim/20191208_ko_serviceaccount_whitespace_fix

ko: Fix whitespace in ServiceAccount glossary entry

Author: k8s-ci-robot

content/ko/docs/reference/glossary/service-account.md

@@ -1,5 +1,5 @@
 ---
-title: 서비스 어카운트(Service Account)
+title: 서비스 어카운트(ServiceAccount)
 id: service-account
 date: 2018-04-12
 full_link: /docs/tasks/configure-pod-container/configure-service-account/