[doc] fix errors in test_visibility_propagation example
* forget to use the access instructions
* wrong use of the function entity_from_eid
* some indentation problems
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')