Links to Gitter jenkins-infra#3335

Fixed 2 broken links.

content/blog/2018/07/2018-07-17-simple-pull-request-plugin.adoc

@@ -193,13 +193,13 @@ Video:
 === How to reach me
 
 * Email: gautamabhishek46@gmail.com
-* Gitter room: https://app.gitter.im/#/room/#jenkinsci_simple-pull-request-job-plugin:gitter.im[]
+* link:https://app.gitter.im/#/room/#jenkinsci_simple-pull-request-job-plugin[Gitter chat]
 
 === References
 
 * link:https://github.com/jenkinsci/simple-pull-request-job-plugin[Project repository]
 * link:/projects/gsoc/2018/simple-pull-request-job-plugin/[Project page]
-* link:https://app.gitter.im/#/room/#jenkinsci_simple-pull-request-job-plugin:gitter.im[Gitter chat]
+* link:https://app.gitter.im/#/room/#jenkinsci_simple-pull-request-job-plugin[Gitter chat]
 * link:https://issues.jenkins.io/issues/?jql=project%20%3D%20Jenkins%20AND%20component%20%3D%20simple-pull-request-job-plugin[Bug Tracker]
 * link:https://github.com/gautamabhishek46/dummy[Demo Repository]
 * link:https://www.youtube.com/watch?v=tuTODhJOTBU&t=3229s[Phase 2 Presentation video](July 12, 2018)