Add note about the property attribute (Property Accessor)

I think we must document the fact that propety is a path which is evaluted by the PropertyAccessor component.
Update entity.rst
Update entity.rst
Update entity.rst
Update entity.rst
feature #3124 Add note about the property attribute (Property Accessor) (raziel057)

This PR was submitted for the 2.2 branch but it was merged into the 2.3 branch instead (closes #3124).

Discussion
----------

Add note about the property attribute (Property Accessor)

I think we must document the fact that propety is a path which is evaluted by the PropertyAccessor component.

Commits
-------

46f1b8b Update entity.rst
7496e68 Update entity.rst
c097f9b Update entity.rst
7d65fed Update entity.rst
6af779d Add note about the property attribute (Property Accessor)