comit changes to FilePicker doc

Author: joaojmendes

docs/documentation/docs/controls/FilePicker.md

@@ -59,6 +59,7 @@ The FilePicker component can be configured with the following properties:
 | label | string | no | Specifies the text describing the file picker. |
 | buttonLabel | string | no | Specifies the label of the file picker button. |
 | buttonIcon | string | no | In case it is provided the file picker will be rendered as an action button. |
+  buttonIconProps | IIconProps | no | In case it is provided the file picker will be rendered as an Icon the and all can define Properties for Icon  |
 | onSave | (filePickerResult: IFilePickerResult) => void | yes | Handler when the file has been selected and picker has been closed. |
 | onChange | (filePickerResult: IFilePickerResult) => void | no | Handler when the file selection has been changed. |
 | context | ExtensionContext \| WebPartContext | yes | Current context. |

src/controls/filePicker/index.ts

@@ -2,3 +2,4 @@ export * from "./FilePicker";
 export * from "./FilePicker.types";
 export * from "./IFilePickerProps";
 export * from "./IFilePickerState";
+export { IIconProps } from "office-ui-fabric-react";