Modular documentation not clear (at least for me)

[backit]

regarding this line of code

In Modular Page documentation, the exemplae refers to a collection self.modular, but in Page Collections documentation page there is no self.modular collection, the most similar is self.modules where is specified that:
Using alias of '@self.modular' is deprecated.
So i don't understand, is self.modular deprecated and docs must be changed in Modular Page, or self.modules is an alias for self.modular and so must be changed Page collections?

Best regards