Delete an outdated comment for read_property and read_dimension. [ci skip]

The comment is outdated as of PHP7.
For example, in the current code, zend_assign_op_overloaded_property() expects the refcount of the returned value from read_property to be greater than 0 when the returned value is a refcounted, to call zval_ptr_dtor() later.

History:
- The same description was originally written in a commit in 2004 alongside the write side. https://github.com/php/php-src/commit/c8c0e979826b677de5f786920289056242ea5c54
- One requested to put the description in somewhere. https://externals.io/message/7789
- Then it was added as a comment in zend_object_handler.h . https://github.com/php/php-src/commit/7d3215d33321173c58db4d86b7398e16c5c55d13
- At the time the comment was written, there were at least three places where the code actually set the reference count to 0 in read_properties.
	- https://github.com/php/php-src/blob/7d3215d33321173c58db4d86b7398e16c5c55d13/ext/dom/php_dom.c#L229
	- https://github.com/php/php-src/blob/7d3215d33321173c58db4d86b7398e16c5c55d13/ext/mysqli/mysqli.c#L190
	- https://github.com/php/php-src/blob/7d3215d33321173c58db4d86b7398e16c5c55d13/ext/simplexml/simplexml.c#L245
- All three of the above were removed during the development of PHP 7.
	- https://github.com/php/php-src/commit/2f0a758fbbf39ff8684d167f86c708cc361db782
	- https://github.com/php/php-src/commit/2402d6cbbc5e04362b23b183f9129a8db230bcce
	- https://github.com/php/php-src/commit/a975c7e0fe95a94c119eb1c8e519b2357aa50dcc
- In the current code, even when they generate and return a refcounted value, its refcount would be 1.

Closes GH-6618.

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