packages,plugins: add package documentation

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/kubernetes-common/api-report.md

@@ -164,6 +164,4 @@ export interface ServiceFetchResponse {
   // (undocumented)
   type: 'services';
 }
-
-// (No @packageDocumentation comment for this package)
 ```

plugins/kubernetes-common/src/index.ts

@@ -14,4 +14,10 @@
  * limitations under the License.
  */
 
+/**
+ * Common functionalities for kubernetes, to be shared between kubernetes and kubernetes-backend plugin
+ *
+ * @packageDocumentation
+ */
+
 export * from './types';