Fix docs - simply run the script instead of sourcing it

Script looks like it is meant to be run and docs mention
running it rather than sourcing, yet the examples sourced it.

Change-Id: Ib4492ae01bee11b562022099cee8b06b4e3ee3c1
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

doc/source/user/quickstart.rst

@@ -570,17 +570,17 @@ Using OpenStack
 
      .. code-block:: console
 
-        . /usr/share/kolla-ansible/init-runonce
+        /usr/share/kolla-ansible/init-runonce
 
      Run ``init-runonce`` script on Ubuntu:
 
      .. code-block:: console
 
-        . /usr/local/share/kolla-ansible/init-runonce
+        /usr/local/share/kolla-ansible/init-runonce
 
    * For development, run:
 
      .. code-block:: console
 
-        . kolla-ansible/tools/init-runonce
+        kolla-ansible/tools/init-runonce