Adding missing documentation to make the docs better

Also fixed a typo I noticed.

Signed-off-by: René Nussbaumer <rn@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

doc/rapi.rst

@@ -439,6 +439,33 @@ Takes the parameters ``mode`` (one of ``replace_on_primary``,
 ``remote_node`` and ``iallocator``.
 
 
+``/2/instances/[instance_name]/activate-disks``
++++++++++++++++++++++++++++++++++++++++++++++++
+
+Activate disks on an instance.
+
+It supports the following commands: ``PUT``.
+
+``PUT``
+~~~~~~~
+
+Takes the parameter ``ignore_size``. When set ignore the recorded
+size (useful for forcing activation when recorded size is wrong).
+
+
+``/2/instances/[instance_name]/deactivate-disks``
++++++++++++++++++++++++++++++++++++++++++++++++++
+
+Deactivate disks on an instance.
+
+It supports the following commands: ``PUT``.
+
+``PUT``
+~~~~~~~
+
+Takes no parameters.
+
+
 ``/2/instances/[instance_name]/tags``
 +++++++++++++++++++++++++++++++++++++
 

lib/rapi/rlib2.py

@@ -678,7 +678,7 @@ class R_2_instances_name_deactivate_disks(baserlib.R_Generic):
     """
     instance_name = self.items[0]
 
-    op = opcodes.OpDeActivateInstanceDisks(instance_name=instance_name)
+    op = opcodes.OpDeactivateInstanceDisks(instance_name=instance_name)
 
     return baserlib.SubmitJob([op])