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Update playbooks_strategies.rst (#72176)

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beside the fact that naming the variable to specify the number of machines executed in *parallel* is named *serial* - the number of hosts chosen in this example is not optimal, either: 2x2 = 4; so - 3 hosts in 2 batches should clear things up a little
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docs/docsite/rst/user_guide/playbooks_strategies.rst
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@ -48,7 +48,7 @@ By default, Ansible runs in parallel against all the hosts in the :ref:`pattern
---
- name: test play
hosts: webservers
serial: 2
serial: 3
gather_facts: False
tasks:
@ -57,34 +57,40 @@ By default, Ansible runs in parallel against all the hosts in the :ref:`pattern
- name: second task
command: hostname
In the above example, if we had 4 hosts in the group 'webservers', Ansible would execute the play completely (both tasks) on 2 of the hosts before moving on to the next 2 hosts::
In the above example, if we had 6 hosts in the group 'webservers', Ansible would execute the play completely (both tasks) on 3 of the hosts before moving on to the next 3 hosts::
PLAY [webservers] ****************************************
TASK [first task] ****************************************
changed: [web3]
changed: [web2]
changed: [web1]
TASK [second task] ***************************************
changed: [web1]
changed: [web2]
changed: [web3]
PLAY [webservers] ****************************************
TASK [first task] ****************************************
changed: [web3]
changed: [web4]
changed: [web5]
changed: [web6]
TASK [second task] ***************************************
changed: [web3]
changed: [web4]
changed: [web5]
changed: [web2]
PLAY RECAP ***********************************************
web1 : ok=2 changed=2 unreachable=0 failed=0
web2 : ok=2 changed=2 unreachable=0 failed=0
web3 : ok=2 changed=2 unreachable=0 failed=0
web4 : ok=2 changed=2 unreachable=0 failed=0
web5 : ok=2 changed=2 unreachable=0 failed=0
web6 : ok=2 changed=2 unreachable=0 failed=0
You can also specify a percentage with the ``serial`` keyword. Ansible applies the percentage to the total number of hosts in a play to determine the number of hosts per pass::