Updates SUMMARY.md

SUMMARY.md

@@ -21,10 +21,10 @@
     * [FLP 不可能性原理](consensus/flp.md)
     * [CAP 原理](consensus/cap.md)
     * [ACID 原则](consensus/acid.md)
+    * [Paxos 与 Raft](consensus/paxos.md)
     * [拜占庭相关问题与算法](consensus/bft.md)
     * [可靠性指标](consensus/availability.md)
     * [小结](consensus/summary.md)
-    * [Paxos 与 Raft](consensus/paxos.md)
 * [密码学相关知识](crypto/README.md)
     * [hash 算法](crypto/hash.md)
     * [数字摘要](crypto/digest.md)