Style fix.

Note: "midst" tends to be used in more literary settings.

spec/test/features/control/delete/list_order.feature

@@ -83,9 +83,9 @@ Feature: Consistent route order after a route deletion in Kapow! server.
       ]
       """
 
-  Scenario: Removing a midst route.
-    After removing a midst route the remaining ones will
-    maintain their relative order and the indexes of the
+  Scenario: Removing a route from the middle.
+    After removing a route from the middle, the remaining ones
+    will maintain their relative order and the indexes of the
     following routes will be decreased by one.
 
     When I delete the second route

spec/test/features/control/insert/list_order.feature

@@ -99,10 +99,10 @@ Feature: Consistent route ordering after inserting a route in a Kapow! server.
         ]
         """
 
-  Scenario: Inserting a midst route.
-    After inserting a midst route the previous route set
-    will maintain their relative order and the indexes
-    of thefollowing routes will be increased by one.
+  Scenario: Inserting a route in the middle.
+    After inserting a route in the middle, the previous
+    route set will maintain their relative order and the indexes
+    of the following routes will be increased by one.
 
     When I insert the route:
       """