zh-Hans: Fix typo (#246)

README-zh-Hans.md

@@ -1621,7 +1621,7 @@ Notes
 | 设计类似于 Google 的搜索引擎      | [queue.acm.org](http://queue.acm.org/detail.cfm?id=988407)<br/>[stackexchange.com](http://programmers.stackexchange.com/questions/38324/interview-question-how-would-you-implement-google-search)<br/>[ardendertat.com](http://www.ardendertat.com/2012/01/11/implementing-search-engines/)<br>[stanford.edu](http://infolab.stanford.edu/~backrub/google.html) |
 | 设计类似于 Google 的可扩展网络爬虫   | [quora.com](https://www.quora.com/How-can-I-build-a-web-crawler-from-scratch) |
 | 设计 Google 文档            | [code.google.com](https://code.google.com/p/google-mobwrite/)<br/>[neil.fraser.name](https://neil.fraser.name/writing/sync/) |
-| 设计类似 Redis 的建值存储        | [slideshare.net](http://www.slideshare.net/dvirsky/introduction-to-redis) |
+| 设计类似 Redis 的键值存储        | [slideshare.net](http://www.slideshare.net/dvirsky/introduction-to-redis) |
 | 设计类似 Memcached 的缓存系统    | [slideshare.net](http://www.slideshare.net/oemebamo/introduction-to-memcached) |
 | 设计类似亚马逊的推荐系统            | [hulu.com](http://tech.hulu.com/blog/2011/09/19/recommendation-system.html)<br/>[ijcai13.org](http://ijcai13.org/files/tutorial_slides/td3.pdf) |
 | 设计类似 Bitly 的短链接系统       | [n00tc0d3r.blogspot.com](http://n00tc0d3r.blogspot.com/) |