[Docs] `php://input` is reusable

Affected page

https://github.com/php/doc-en/blob/master/language/wrappers/php.xml

Current issue

In the documentation for "New features" in PHP 5.6 it mentions that "php://input is reusable": "php://input may now be reopened and read as many times as required."

https://github.com/php/doc-en/blob/master/appendices/migration56/new-features.xml

As far as I can see, this doesn't seem to be discussed on the page for php://input, or anywhere else in the documentation?

It seems like this is something that should be mentioned in the main part of the documentation, not just in the PHP 5.6 section. (Especially if the PHP 5.6 section is likely to be removed soon - then it won't be documented anywhere.)

Suggested improvement

I would suggest mentioning this in the page https://github.com/php/doc-en/blob/master/language/wrappers/php.xml - that seems to be the primary location where php://input is documented.

Start by reading language/wrappers/php.xml and compare its existing php://input documentation with the PHP 5.6 note in appendices/migration56/new-features.xml. Update the primary php://input documentation to cover its reusability, with wording consistent with the existing documentation; done means this behavior is documented outside the migration page.