Corrected translation, improved formatting.

Corrected translation "类型转换" from "类型检查", improved formatting.
Merge pull request #202 from yulingtianxia/develop

update generics
Merge pull request #201 from twlkyao/patch-1

Corrected translation, improved formatting.
make gitbook
update generics

修改了一处未翻译完整的语句