Update run-agent-master.md

Author: hlindberg

how-to/run-agent-master.md

@@ -1,7 +1,7 @@
 Run Agent and Master from source on same machine
 ==
 ```
-bundle exec puppet puppet master --no-daemonize --certname localhost --dns_alt_names localhost --verbose
+bundle exec puppet master --no-daemonize --certname localhost --dns_alt_names localhost --verbose
 bundle exec puppet agent -t --certname localhost --server localhost
 ```