Update credentials.ipynb

Author: umernalla

Configuration/credentials.ipynb

@@ -54,9 +54,9 @@
     "These function will be used by most of the other tutorials to reduce session related code replication.\n",
     "\n",
     "Set your default session_type below with **SESSION_TYPE** variable below - valid values are:\n",
-    "- \"desktop\"\n",
-    "- \"platform\"\n",
-    "- \"deployed\"  \n",
+    "- \"**desktop**\"\n",
+    "- \"**platform**\"\n",
+    "- \"**deployed**\"  \n",
     "\n",
     "This will avoid the need to specif it in all the tutorials.\n",
     "\n",