Docs cleanup: sort subnet commands

Change-Id: I43c0052ec5ed2e94b203a0befc4b39d3522d4e9c

Author: Dean Troyer

doc/source/command-objects/subnet.rst

@@ -4,22 +4,6 @@ subnet
 
 Network v2
 
-subnet delete
--------------
-
-Delete a subnet
-
-.. program:: subnet delete
-.. code:: bash
-
-    os subnet delete
-        <subnet>
-
-.. _subnet_delete-subnet:
-.. describe:: <subnet>
-
-    Subnet to delete (name or ID)
-
 subnet create
 -------------
 
@@ -128,6 +112,22 @@ Create new subnet
 
      Name of subnet to create
 
+subnet delete
+-------------
+
+Delete a subnet
+
+.. program:: subnet delete
+.. code:: bash
+
+    os subnet delete
+        <subnet>
+
+.. _subnet_delete-subnet:
+.. describe:: <subnet>
+
+    Subnet to delete (name or ID)
+
 subnet list
 -----------