Update Chinese version of "support_features" (#1186)

Author: alaahong

website_and_docs/content/documentation/webdriver/support_features/_index.zh-cn.md

@@ -1,16 +1,16 @@
 ---
 title: "Support features"
-linkTitle: "Support Features"
+linkTitle: "额外功能"
 weight: 18
 description: >
-  Support classes provide optional higher level features.
+  针对更高层面功能的额外支持类.
 aliases: [
 "/documentation/zh-cn/support_packages/",
 "/zh-cn/documentation/support_packages/",
 "/zh-cn/documentation/additional_features/",
 ]
 ---
 
-The core libraries of Selenium try to be low level and non-opinionated.
-The Support classes in each language provide opinionated wrappers for common interactions
-that may be used to simplify some behaviors.
+Selenium的核心库试图提供底层以及普适的功能.
+每种语言的支持类都为常见交互提供特定的包装器, 
+可用于简化某些行为.