Update CMX history info to discuss Queued Timeout status

Signed-off-by: Kyle Squizzato <kyle@replicated.com>

Author: squizzi

docs/vendor/compatibility-matrix-usage.md

@@ -9,11 +9,17 @@ historical information about both clusters and VMs, as shown below:
 ![Compatibility Matrix History Page](/images/compatibility-matrix-history.png)
 [View a larger version of this image](/images/compatibility-matrix-history.png)
 
-Only _terminated_ clusters and VMs that have been deleted or errored are displayed on the **History** page.
-
-The top of the **History** page displays the total number of terminated clusters and VMs
-in the selected time period as well as the total cost and usage time for
-the terminated resources.
+The **History** page displays clusters and VMs that have either been
+_terminated_ or remained _queued_ for greater than 24 hours and have been
+removed.  If a cluster or VM has been removed after sitting in _queued_ state
+for greater than 24 hours, it will be displayed as "Queued Timeout" within the
+status column.
+
+The top of the **History** page displays the total number of non-running clusters
+and VMs in the selected time period as well as the total cost and usage time
+for the non-running resources.  The total cost is calculated at termination and
+is based on the time the resource was running.  Clusters and VMs that never
+entered _running_ state are not included in the total cost and usage time.
 
 The table includes cluster and VM entries with the following columns:
 - **Name:** The name of the cluster or VM.