Update Sonatype release link in build_release.py

dev-tools/build_release.py

@@ -660,7 +660,7 @@ if __name__ == '__main__':
       Release successful pending steps:
         * create a new vX.Y.Z label on github for the next release, with label color #dddddd (https://github.com/elasticsearch/elasticsearch/labels)
         * publish the maven artifacts on Sonatype: https://oss.sonatype.org/index.html
-           - here is a guide: https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide#SonatypeOSSMavenRepositoryUsageGuide-8a.ReleaseIt
+           - here is a guide: http://central.sonatype.org/pages/releasing-the-deployment.html
         * check if the release is there https://oss.sonatype.org/content/repositories/releases/org/elasticsearch/elasticsearch/%(version)s
         * announce the release on the website / blog post
         * tweet about the release