docs:monitor: Fill in inventory attribute details

The `inventory` attribute contains a string of the relative path under
`/xyz/openbmc_project/inventory` where the fan's OperationalStatus
interface exists.

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: I6be09429c940fadb28d194c2519cf5afb3d502d9
diff --git a/docs/monitor/inventory.md b/docs/monitor/inventory.md
index d5cfb7f..3698516 100644
--- a/docs/monitor/inventory.md
+++ b/docs/monitor/inventory.md
@@ -1,9 +1,40 @@
 # inventory
 
 ## Description
-
+The relative path under inventory where the fan's inventory object exists on
+D-Bus. Inventory's base path is `/xyz/openbmc_project/inventory` resulting in
+the fan's inventory object path being the base path plus what's given here.  
+i.e.) `/xyz/openbmc_project/inventory/system/chassis/motherboard/fan0`
 
 ## Attribute Value(s)
-
+string
 
 ## Example
+<pre><code>
+{
+  "fans": [
+    {
+      <b><i>"inventory": "/system/chassis/motherboard/fan0"</i></b>,
+      "allowed_out_of_range_time": 30,
+      "functional_delay": 5,
+      "deviation": 15,
+      "num_sensors_nonfunc_for_fan_nonfunc": 1,
+      "monitor_start_delay": 30,
+      "fan_missing_error_delay": 20,
+      "nonfunc_rotor_error_delay": 0,
+      "sensors": [
+        {
+          "name": "fan0_0",
+          "has_target": true
+        },
+        {
+          "name": "fan0_1",
+          "has_target": false,
+          "factor": 1.45,
+          "offset": -909
+        }
+      ]
+    }
+  ]
+}
+</code></pre>