Utility API docs: Add @import functions, variables to the examples.

Created by: iatek

Utility API docs: Add @import functions, variables to the examples.

Since _utilities references, _variables, and _variables references _functions, in order to use the API you must import like..

@import "bootstrap/scss/functions";
@import "bootstrap/scss/variables";
@import "bootstrap/scss/utilities";

$utilities: map-merge(
  $utilities,
  (
    "cursor": (
      property: cursor,
      class: cursor,
      responsive: true,
      values: auto pointer grab,
    )
  )
);

Should this be mention in the Using the API section, perhaps explain in the text that says "Make sure our _utilities.scss is imported first,"? Or, simply add the correct @imports in each of the examples?