Add @packageDocumentation

Signed-off-by: Charles de Dreuille <charles.dedreuille@gmail.com>

packages/canon/report.api.md

@@ -2625,6 +2625,4 @@ export const IconProvider: ({
   children: ReactNode;
   overrides: Partial<Record<IconNames, React_2.ComponentType>>;
 }) => React_2.JSX.Element;
-
-// (No @packageDocumentation comment for this package)
 ```

packages/canon/src/index.ts

@@ -14,7 +14,12 @@
  * limitations under the License.
  */
 
-// Components
+/**
+ * Components used by Backstage plugins and apps
+ *
+ * @packageDocumentation
+ */
+
 export * from './components/button';
 export * from './components/box';
 export * from './components/icon';