Revert "Issue #3379184 by dinarcon, heddn: Document that source IDs can only... (!8) · Merge requests · project / migrate_source_csv

Revert "Issue #3379184 by dinarcon, heddn: Document that source IDs can only contain alphanumeric characters or underscores"

This reverts commit 91b1488b.

Revert "Issue #3379184 by dinarcon, heddn: Document that source IDs can only...