Update the repositories file with stein.

Add the stein in repository and remove ocata.

Change-Id: I4cb410d65555887e158d731f3998c0dda66db262

_custom/custom.css

@@ -83,6 +83,7 @@
 .otop {background: #dfb;}
 .ptoq {background: #afd;}
 .qtor {background: #aee;}
+.rtos {background: #ade;}
 .validations {background: #fdd;}
 .optional {background: #ffe;}
 

doc/source/install/repositories.txt

@@ -34,14 +34,14 @@ For example
   Enable the appropriate repos for the desired release, as indicated below.
   Do not enable any other repos not explicitly marked for that release.
 
-  .. admonition:: Ocata
-     :class: ocata ntoo
+  .. admonition:: Pike
+     :class: pike otop
 
-     Enable the current Ocata repositories
+     Enable the current Pike repositories
 
      .. code-block:: bash
 
-        sudo -E tripleo-repos -b ocata current
+        sudo -E tripleo-repos -b pike current
 
      .. admonition:: Ceph
         :class: ceph
@@ -50,16 +50,16 @@ For example
 
         .. code-block:: bash
 
-            sudo -E tripleo-repos -b ocata current ceph
+            sudo -E tripleo-repos -b pike current ceph
 
-  .. admonition:: Pike
-     :class: pike otop
+  .. admonition:: Queens
+     :class: queens ptoq
 
-     Enable the current Pike repositories
+     Enable the current Queens repositories
 
      .. code-block:: bash
 
-        sudo -E tripleo-repos -b pike current
+        sudo -E tripleo-repos -b queens current
 
      .. admonition:: Ceph
         :class: ceph
@@ -68,16 +68,16 @@ For example
 
         .. code-block:: bash
 
-           sudo -E tripleo-repos -b pike current ceph
+           sudo -E tripleo-repos -b queens current ceph
 
-  .. admonition:: Queens
-     :class: queens ptoq
+  .. admonition:: Rocky
+     :class: rocky qtor
 
-     Enable the current Queens repositories
+     Enable the current Rocky repositories
 
      .. code-block:: bash
 
-        sudo -E tripleo-repos -b queens current
+        sudo -E tripleo-repos -b rocky current
 
      .. admonition:: Ceph
         :class: ceph
@@ -86,16 +86,16 @@ For example
 
         .. code-block:: bash
 
-           sudo -E tripleo-repos -b queens current ceph
+           sudo -E tripleo-repos -b rocky current ceph
 
-  .. admonition:: Rocky
-     :class: rocky mton
+  .. admonition:: Stein
+     :class: stein rtos
 
-     Enable the current Rocky repositories
+     Enable the current Stein repositories
 
      .. code-block:: bash
 
-         sudo -E tripleo-repos -b rocky current
+         sudo -E tripleo-repos -b stein current
 
      .. admonition:: Ceph
         :class: ceph
@@ -104,7 +104,7 @@ For example
 
         .. code-block:: bash
 
-           sudo -E tripleo-repos -b rocky current ceph
+           sudo -E tripleo-repos -b stein current ceph
 
   .. admonition:: Fedora 28
      :class: fedora28