Add posibility to set ssd scheduler via udev.

    Available values: noop, cfq, deadline (or other available scheduler in kernel)
    Default value: deadline

Closes-bug: PROD-36140
Change-Id: I90e88b9cbab9a1dd004ba629dad84a1e537cbb4b
diff --git a/README.rst b/README.rst
index 03dc3d5..641a335 100644
--- a/README.rst
+++ b/README.rst
@@ -267,6 +267,21 @@
             - '!SUPPORT_SHELLS'
             - '!SUPPORT_RESTRICTED'
 
+Set ssd scheduler on physical nodes:
+Default values are
+  enabled: true
+  name: deadline
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        ...
+        ssd_scheduler:
+          enabled: true
+          name: cfq
+        ...
+
 Linux with package, latest version:
 
 .. code-block:: yaml