[doc] Add the possible status for attachment
Add the possible status of the attachment, and also
make short description for each status.
@@ -10,6 +10,29 @@ deletes attachment.
microversion. `Complete attachment` is new as of the 3.44
microversion.
+When you create, list, update, or delete attachment, the possible
+status values are:
+
+**VolumeAttachment statuses**
+
++------------------+--------------------------------------------------------+
+| Status | Description |
++------------------+--------------------------------------------------------+
+| attached | A volume is attached for the attachment. |
++------------------+--------------------------------------------------------+
+| attaching | A volume is attaching for the attachment. |
++------------------+--------------------------------------------------------+
+| detached | A volume is detached for the attachment. |
++------------------+--------------------------------------------------------+
+| reserved | A volume is reserved for the attachment. |
++------------------+--------------------------------------------------------+
+| error_attaching | A volume is error attaching for the attachment. |
++------------------+--------------------------------------------------------+
+| error_detaching | A volume is error detaching for the attachment. |
++------------------+--------------------------------------------------------+
+| deleted | The attachment is deleted. |
++------------------+--------------------------------------------------------+
+
Delete attachment
~~~~~~~~~~~~~~~~~
