Scrub `ops.psaops.local` placeholder hostname in CLI help text

[kbens]

Two CLI help strings use ops.psaops.local as an example URL:

src/psa/commands/init.py:55: help="PSA-OPS URL (e.g., http://ops.psaops.local:8000)"
src/psa/commands/config.py:55: psa config init -r http://ops.psaops.local:8000 -n abc-123-uuid

Not a real domain (.local is mDNS) and the ops command group is hidden by default, but example.local (or ops.example.com) is a more conventional placeholder for public-facing docs.

Fix

Swap ops.psaops.local → ops.example.local in both locations.