repair: Fix the incorrect comments for _all_nodes
repair: Fix the incorrect comments for _all_nodes

The _all_nodes field contains both the peer nodes and the node itself.

Refs #7103

scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla