swh-c4-model/provenance: Add self-reference

That will ease delivery to the hedgedoc document [1] [1] https://hedgedoc.softwareheritage.org/6DnDnX6TS6aZ0c-sfTLisg?edit Refs. swh/infra/sysadm-environment#5608

swh-c4-model/provenance: Add self-reference
e9e4f3d2 · Antoine R. Dumont · fe26baef · e9e4f3d2
Unverified Commit e9e4f3d2 authored 1 month ago by Antoine R. Dumont
--- a/vsellier/swh-c4-model/docs/provenance-v0.3/provenance.md
+++ b/vsellier/swh-c4-model/docs/provenance-v0.3/provenance.md
@@ -3,6 +3,7 @@
 ## References

 - [Provenance v0.3.3 deployment spec](https://hedgedoc.softwareheritage.org/scsWvzQZRO2HW2gisANXBw?view)
+- [Source code](https://gitlab.softwareheritage.org/swh/devel/snippets/-/merge_requests/27)

 ## Communication