message: fix: correct createBreakpoints import
diff: @@ -149,7 +149,8 @@ To provide easier extensibility and typesafety, breakpoints should now be
  created through `createBreakpoints` by passing an object:
  ```diff
  -+ import { createBreakpoints, extendTheme } from "@chakra-ui/core"
  ++ import { extendTheme } from "@chakra-ui/core"
  ++ import { createBreakpoints } from "chakra-ui/theme-tools"
  + const breakpoints = createBreakpoints({
  