Drop http:// scheme from env-var example in horizontal-classification

Lychee scans URLs inside code spans (include_verbatim) and tries to
fetch them. http://auth-service:8080 isn't a real URL — it's an
example of what a service-reference env var might look like inside a
customer's manifests. Stripping the scheme keeps the example readable
without giving lychee something to dereference.

Author: SeanTAllen

antithesis-k8s-onboarding-assistance/references/horizontal-classification.md

@@ -28,7 +28,7 @@ Three confidence tiers. Document edges by tier in the working file's *Horizontal
 **High confidence — direct evidence:**
 
 - `Service` definitions and the workloads selecting them (selector → labels)
-- Env vars containing service URLs (e.g., `DB_HOST=postgres.svc.cluster.local`, `AUTH_API_URL=http://auth-service:8080`)
+- Env vars containing service references (e.g., `DB_HOST=postgres.svc.cluster.local`, `AUTH_API_URL=auth-service:8080/api`)
 - ConfigMap entries that reference services
 - Init container `wait-for` style dependencies (often invoke `nslookup`, `nc`, or shell scripts naming services)
 - PVC claims and the StorageClass they reference