Merge pull request #3200 from Ph0tonic/Ph0tonic-patch-managed-services

docs: fix the jupyterhub managed service example's networking rules

docs/source/administrator/services.md

@@ -68,4 +68,21 @@ hub:
       - port: 8181
         targetPort: 8181
         name: fastapi
+
+# The proxy.chp.networkPolicy.egress configuration below is required if the
+# service should be accessible for users. If it shouldn't be, you should instead
+# set the chart configuration services.fastapi.display to false as otherwise
+# JupyterHub will provide a broken link in the Services menu for users to go to
+# /services/fastapi/.
+proxy:
+  chp:
+    networkPolicy:
+      egress:
+        - to:
+            - podSelector:
+                matchLabels:
+                  app: jupyterhub
+                  component: hub
+          ports:
+            - port: 8181
 ```