Updates the DS interfaces to use new syntax

[mallardduck]

per title, this fixes the current build issues.
this is accomplished by updating the Data Structures docs to match the examples from here: #2563
once merged these interfaces will use the proper new syntax and fixes both the builds and the current render issues on php.net

[afilina]

Just to confirm, does this mean that the docs become buildable using phd's HEAD?
Reference: #2638 (comment)

[mallardduck]

@afilina - yeah, this PR should allow all HEAD tags for PHD/en/src to play nice again. Sorry for the headache there on your PR, this is all kinda my fault when I created a bodge level (in hindsight) interface fix. And then @Girgias found a more proper solution which required some updates that took time - and by then I forgot to follow up with this needed PR.

[Girgias]

I still don't understand why I don't have the build failures :(

[Lewiscowles1986]

😊 I had cloned @afilina branch... So my master was never changing to be ahead. I was internally screaming just now as it still wasn't working, but upon debugging my setup; my commit sha was not updating. git remote -v to the rescue. It now builds 🙌