Update playbooks_delegation.rst

There's a space missing "hosts:127.0.0.1" should be "hosts: 127.0.0.1"

docsite/rst/playbooks_delegation.rst

@@ -175,7 +175,7 @@ It may be useful to use a playbook locally, rather than by connecting over SSH.
 for assuring the configuration of a system by putting a playbook on a crontab.  This may also be used
 to run a playbook inside an OS installer, such as an Anaconda kickstart.
 
-To run an entire playbook locally, just set the "hosts:" line to "hosts:127.0.0.1" and then run the playbook like so::
+To run an entire playbook locally, just set the "hosts:" line to "hosts: 127.0.0.1" and then run the playbook like so::
 
     ansible-playbook playbook.yml --connection=local