Typing error in CHANGELOG

[ginona]

There is a typing error in a breaking change for the V3.0.0, the error is that "AcccordionItemHeading" has been written with 3 c, but should be only 2 "AccordionItemHeading"

I would like to asign this issue to myself.

[ginona]

@holloway can you please check the pr that I created

[holloway]

@emlyn-h @phil-hodgson-1st

[ginona]

This issue has been fixed.