The dgeni link system is quite clever. As long as the code name you provide identifies the doc unambiguously then you can get away with very little.  So all the following links would work:
* `{@link module:ng.service:$interpolate Markup}`
* `{@link module:ng.$interpolate Markup}`
* `{@link ng.service:$interpolate Markup}`
* `{@link ng.$interpolate Markup}`
* `{@link service:$interpolate Markup}`
* `{@link $interpolate Markup}`

So we could actually change this to the last, simplest one. If you wanted :-)

In the case of something like `$log`, you have to provide the module, too, since `$log` is defined both in `ng` and `ngMock`.