fix markdown lint

Author: phith0n

jetty/CVE-2021-34429/README.md

@@ -14,7 +14,7 @@ There are 3 types of payload that exfiltrate the content of `WEB-INF/web.xml`:
 
 The vulnerability affects the Jetty 9.4.37-9.4.42, 10.0.1-10.0.5, 11.0.1-11.0.5.
 
-References: 
+References:
 
 - https://github.com/eclipse/jetty.project/security/advisories/GHSA-vjv5-gp2w-65vm
 - https://xz.aliyun.com/t/10039
@@ -27,7 +27,7 @@ Execute the following command to start a Jetty 9.4.40 server.
 docker-compose up -d
 ```
 
-After the server starts, visit ``http://your-ip:8080`` to see an example page. 
+After the server starts, visit ``http://your-ip:8080`` to see an example page.
 
 ## Exploit