elixir: shorten some sentences

elixir.md

@@ -105,6 +105,7 @@ Pattern matching works in function parameters too.
 
 Control flow
 ------------
+{: .-three-column}
 
 ### If
 
@@ -122,9 +123,9 @@ case {1, 2, 3} do
   {4, 5, 6} ->
     "This clause won't match"
   {1, x, 3} ->
-    "This clause will match and bind x to 2 in this clause"
+    "This will match and bind x to 2"
   _ ->
-   "This clause would match any value"
+   "This will match any value"
 end
 ```