Change "deconstructor" to "destructor" in NOTIFICATION_PREDELETE docs

[ItzCog]

This is probably a bit nitpicky and unnecessary, but as far as I can see, every seemingly reliable sources refer to this concept
as a "destructor" rather than a "deconstructor", including the Wikipedia page title. "Deconstructor" seems very rarely used and is considered incorrect by some.

[tetrapod00]

For additional confirmation, if you search for "deconstructor" in the docs, you get only this single existing result. The same NOTIFICATION_PREDELETE is described as a "destructor" elsewhere, as well.

[fire]

As an English speaker object destructor is the way I would describe this concept.

[akien-mga]

Thanks!