Pos addons 10.0 pos event registration docs

[ghost]

Previously 733 PR

[itpp-bot]

1 installable module is updated:

└─ pos_event_registration/
   ├─ README.rst
   ├─ __manifest__.py
   ├─ doc/
   |  └─ index.rst
   ├─ images/
   |  └─ registerattendees.jpg
   └─ static/
      └─ description/
         ├─ index.html
         ├─ reg1.png
         ├─ reg2.png
         └─ reg3.png

Not installable modules remain unchanged.

No new features in doc/changelog.rst files of installable modules

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