remove redundant string

Current prepend attribute will lead the string "ConfigMap 是 " repeated.

The original description is:
“ConfigMap 是 configMap 是一种 API 对象，用来将非机密性的数据保存到健值对中。使用时可以用作环境变量、命令行参数或者存储卷中的配置文件。”

So I think we'd better remove the redandunt string block

Author: popozy

content/zh/docs/concepts/configuration/configmap.md

@@ -6,7 +6,7 @@ weight: 20
 
 <!-- overview -->
 
-{{< glossary_definition term_id="configmap" prepend="" length="all" >}}
+{{< glossary_definition term_id="configmap" length="all" >}}
 
 {{< caution >}}
 <!--