just use this to link to it:

````rst
:ref:`intl.collator.construct`
````

The name of the reference link defaults to the name of the heading after the pointer (`__construct($locale)` in this case). If you want it to be `Collator::__construct()`, the ref link needs to be changed to this:

````rst
:ref:`Collator::__construct() <intl.collator.construct>`
````