docs: PDP health check endpoint is /healthy (#480)

Co-authored-by: Zeev Manilovich <zeevmoney@users.noreply.github.com>

Author: kevinmichaelchen

docs/how-to/deploy/overview.mdx

@@ -84,7 +84,7 @@ There are a few things you need to make sure you do:
 
 1. **API Service** - You need to open up it's port 7000 (often mapped to 7766 when running locally)
 2. **OPA Service** - You can open up port 8181 to expose OPA directly
-3. Use the `/healthcheck` endpoint on the API to check for readiness
+3. Use the `/healthy` endpoint on the API to check for readiness
 
 :::info Health Check for PDP