docs: fix deploy.sh port comments (4200/4201 -> 8765/8766) (#1413)

Comments referenced ports 4200/4201 but docker-compose.yml maps:
- nexus-main -> 8765
- nexus-staging -> 8766

Fixes #1413.

deploy.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # deploy.sh — spin up (or update) the Nexus staging environment
-# Usage: ./deploy.sh          — rebuild and restart nexus-main (port 4200)
-#        ./deploy.sh staging  — rebuild and restart nexus-staging (port 4201)
+# Usage: ./deploy.sh          — rebuild and restart nexus-main (port 8765)
+#        ./deploy.sh staging  — rebuild and restart nexus-staging (port 8766)
 set -euo pipefail
 
 SERVICE="${1:-nexus-main}"