optimize some descriptions for swarm nodes.md

Signed-off-by: lixiaobing10051267 <li.xiaobing1@zte.com.cn>

docs/swarm/how-swarm-mode-works/nodes.md

@@ -43,12 +43,12 @@ manager. If the manager in a single-manager swarm fails, your services will
 continue to run, but you will need to create a new cluster to recover.
 
 To take advantage of swarm mode's fault-tolerance features, Docker recommends
-you implement an odd number of nodes nodes according to your organization's
+you implement an odd number of nodes according to your organization's
 high-availability requirements. When you have multiple managers you can recover
 from the failure of a manager node without downtime.
 
 * A three-manager swarm tolerates a maximum loss of one manager.
-* A five-manager swarm tolerates a maximum simultaneous loss two
+* A five-manager swarm tolerates a maximum simultaneous loss of two
 manager nodes.
 * An `N` manager cluster will tolerate the loss of at most
 `(N-1)/2` managers.