docs: fix coinflip recursive example

[tculp]

Fix the resursive example to call the coinflip template, which was NOT recursive.

[alexec]

Thank you! Could you run this an attach the result please?

[tculp]

Name:                coinflip-recursive-9gzmm
Namespace:           argo
ServiceAccount:      unset (will run with the default ServiceAccount)
Status:              Succeeded
Conditions:
 PodRunning          False
 Completed           True
Created:             Tue May 10 13:44:54 -0400 (40 seconds ago)
Started:             Tue May 10 13:44:54 -0400 (40 seconds ago)
Finished:            Tue May 10 13:45:34 -0400 (now)
Duration:            40 seconds
Progress:            4/4
ResourcesDuration:   5s*(1 cpu),1s*(100Mi memory)

STEP                         TEMPLATE   PODNAME                              DURATION  MESSAGE
 ✔ coinflip-recursive-9gzmm  coinflip
 ├───✔ flip-coin             flip-coin  coinflip-recursive-9gzmm-3059564890  3s
 └─┬─○ heads                 heads                                                     when 'tails == heads' evaluated false
   └─✔ tails                 coinflip
     ├───✔ flip-coin         flip-coin  coinflip-recursive-9gzmm-608008902   2s
     └─┬─○ heads             heads                                                     when 'tails == heads' evaluated false
       └─✔ tails             coinflip
         ├───✔ flip-coin     flip-coin  coinflip-recursive-9gzmm-2566434138  3s
         └─┬─✔ heads         heads      coinflip-recursive-9gzmm-3038940703  3s
           └─○ tails         coinflip                                                  when 'heads == tails' evaluated false

This workflow does not have security context set. You can run your workflow pods more securely by setting it.
Learn more at https://argoproj.github.io/argo-workflows/workflow-pod-security-context/