docs: update content

Author: mrholek

docs/4.0/components/accordion.mdx

@@ -11,7 +11,6 @@ import { useState } from 'react'
 import {
   CAccordion,
   CAccordionBody,
-  CAccordionButton,
   CAccordionCollapse,
   CAccordionHeader,
   CAccordionItem 
@@ -302,9 +301,6 @@ Add `alwaysOpen` property to make accordion items stay open when another item is
 ### CAccordionBody
 `markdown:CAccordionBody.api.mdx`
 
-### CAccordionButton
-`markdown:CAccordionButton.api.mdx`
-
 ### CAccordionHeader
 `markdown:CAccordionHeader.api.mdx`