Doccomment in EmbeddedDataSource.php not formatted correctly

Problem/Motivation

The phpdoc for class EmbeddedDataSource gives an example on how to use it in a migration configuration file.
Unfortunately the ids-key in the code example isn't indented correctly which will cause the yaml parser to throw an error
if this snippet is copy-pasted.

see e.g. core/modules/block_content/migration_templates/block_content_type.yml for reference.