Minor error in changelog for Pylint 3.0

[phormio]

The changelog describes kwarg-superseded-by-positional-arg as a checker, but it's actually a message.

The full sentence is:

Add a new checker kwarg-superseded-by-positional-arg to warn when a function is called with a keyword argument which shares a name with a positional-only parameter and the function contains a keyword variadic parameter dictionary.

[DanielNoord]

@phormio Do you want to open a PR to fix this?