fix: Fix `aria-controls` attribute in `fwb-sidebar-dropdown-item` component and add documentation to assess ARIA allowed attribute issue

[bcostaaa01]

When using the FwbSidebarDropdownItem component together with Chromatic Storybook, it throws an Accessibility Test error due to ARIA attribute value as attached in the following screenshot:

Suggested Fix

• rename aria-controls="dropdown-example" to dropdown-content
• add documentation to tell user to set id to dropdown-content in a wrapping div element when using the component

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[cogor]

LGTM