office-ui-fabric-react v6.163.0

Minor changes

• Dropdown: add correctly cased onRenderPlaceholder prop and deprecate onRenderPlaceHolder, plus example updates (commit by ecraig12345, pr #8506)
• Added order property to StackItem (commit by jpalo, pr #8515)
• HoverCard: adds a public dismiss method to allow instant dismiss of the card. (commit by Vitalius1, pr #8490)

Patches

• Persisted callout fixes (commit by ddlbrena, pr #8488)
• DocPage: add separate prop for overriding native props component name (commit by ecraig12345, pr #8512)
• Pickers: condionally render the list of the selected items only if there are any items to display. Fixes the aria role="list" bug where a list must contain one or more list items. (commit by Vitalius1, pr #8516)
• Spinner and Slider example updates (commit by ecraig12345, pr #8509)
• TextField example updates (commit by ecraig12345, pr #8504)