Update setup.mdx (#4789)

Summary:
Adding missing semicolon.

Added a missing semicolon in java code.

## Changelog
Update documentation.

Pull Request resolved: https://github.com/facebook/flipper/pull/4789

Test Plan: Does not require a test plan.

Reviewed By: antonk52

Differential Revision: D46355062

Pulled By: passy

fbshipit-source-id: 20c398018b1d2deffb9b1a755d2c5a1543e48c21

desktop/plugins/public/databases/docs/setup.mdx

@@ -21,7 +21,7 @@ client.addPlugin(new DatabasesFlipperPlugin(new SqliteDatabaseDriver(context, ne
         for (String databaseName : context.databaseList()) {
             databaseFiles.add(context.getDatabasePath(databaseName));
         }
-        databaseFiles.add("...path_to_your_db...")
+        databaseFiles.add("...path_to_your_db...");
         return databaseFiles;
     }
 })));