Update raft-algorithm.md

Author: Snailclimb

docs/distributed-system/theorem&algorithm&protocol/raft-algorithm.md

@@ -163,4 +163,5 @@ raft 的要求之一就是安全性不依赖于时间：系统不能仅仅因为
 - https://tanxinyu.work/raft/
 - https://github.com/OneSizeFitsQuorum/raft-thesis-zh_cn/blob/master/raft-thesis-zh_cn.md
 - https://github.com/ongardie/dissertation/blob/master/stanford.pdf
-- https://knowledge-sharing.gitbooks.io/raft/content/chapter5.html
+- https://knowledge-sharing.gitbooks.io/raft/content/chapter5.html
+