[CORD-2709] Updating documentation branches to include 5.0

Change-Id: I35eab752d2e2361c327cfff2559f6327146c1904
(cherry picked from commit d8a2b7a0b7f0a8952d0fc835f394656996b58d4b)
(cherry picked from commit 54cbdc4f0d560b1152f239f8ddfaf03d3d6a0fca)
(cherry picked from commit 753ad1271228d437ea467794483df753797811eb)
diff --git a/docs/book.json b/docs/book.json
index 3159d1d..de5e345 100644
--- a/docs/book.json
+++ b/docs/book.json
@@ -19,8 +19,12 @@
           "text": "Master (Devel)"
         },
         {
+          "value": "/cord-5.0",
+          "text": "5.0 (Stable)"
+        },
+        {
           "value": "/cord-4.1",
-          "text": "4.1"
+          "text": "4.1 (Stable)"
         },
         {
           "value": "/cord-4.0",