add kubernetes service account token file (#1644)

* add kubernetes service account token file

* Update content/docs/reference/reference.json

Co-authored-by: zachary painter <[email protected]>

* Update content/docs/reference/reference.json

Co-authored-by: zachary painter <[email protected]>

---------

Co-authored-by: zachary painter <[email protected]>

Author: calebdoxsey

content/docs/reference/reference.json

@@ -985,7 +985,15 @@
     "title": "Kubernetes Service Account Token",
     "path": "/routes/kubernetes-service-account-token",
     "services": ["proxy"],
-    "description": "String or relative file location containing a Kubernetes bearer token",
+    "description": "String containing a Kubernetes bearer token.",
+    "type": "string"
+  },
+  "kubernetes-service-account-token-file": {
+    "id": "kubernetes-service-account-token-file",
+    "title": "Kubernetes Service Account Token File",
+    "path": "/routes/kubernetes-service-account-token-file",
+    "services": ["proxy"],
+    "description": "File location containing a Kubernetes bearer token.",
     "type": "string"
   },
   "service-account-token": {