相关的issue

#I4X888:Modify the similar problem of two interface descriptions in plainarray

原因（目的、解决的问题等）

Modify the similar problem of two interface descriptions in plainarray

描述（做了什么，变更了什么）

The descriptions of getindexofkey and getindexofvalue are similar. In
order to distinguish them, the specified element is modified to the
specified value element in getIndexOfValue

测试用例（新增、改动、可能影响的功能）

no effect