packages,plugins: add package documentation

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

plugins/sentry/api-report.md

@@ -124,6 +124,4 @@ export { sentryPlugin };
 // src/api/sentry-issue.d.ts:21:9 - (ae-forgotten-export) The symbol "EventPoint" needs to be exported by the entry point index.d.ts
 // src/api/sentry-issue.d.ts:31:5 - (ae-forgotten-export) The symbol "SentryIssueMetadata" needs to be exported by the entry point index.d.ts
 // src/api/sentry-issue.d.ts:44:5 - (ae-forgotten-export) The symbol "SentryProject" needs to be exported by the entry point index.d.ts
-
-// (No @packageDocumentation comment for this package)
 ```

plugins/sentry/src/index.ts

@@ -14,6 +14,12 @@
  * limitations under the License.
  */
 
+/**
+ * A Backstage plugin that integrates towards Sentry
+ *
+ * @packageDocumentation
+ */
+
 export * from './api';
 export * from './components';
 export { sentryPlugin, sentryPlugin as plugin } from './plugin';