fixed a paragraph order (#1570)

docs/src/main/tut/typeclasses/monad.md

@@ -60,6 +60,21 @@ implicit def optionMonad(implicit app: Applicative[Option]) =
 follows this tradition by providing implementations of `flatten` and `map`
 derived from `flatMap` and `pure`.
 
+Part of the reason for this is that name `flatMap` has special significance in
+scala, as for-comprehensions rely on this method to chain together operations
+in a monadic context.
+
+```tut:book
+import scala.reflect.runtime.universe
+
+universe.reify(
+  for {
+    x <- Some(1)
+    y <- Some(2)
+  } yield x + y
+).tree
+```
+
 In addition to requiring `flatMap` and `pure`, Cats has chosen to require
 `tailRecM` which encodes stack safe monadic recursion, as described in
 [Stack Safety for Free](http://functorial.com/stack-safety-for-free/index.pdf) by
@@ -87,20 +102,7 @@ implicit val optionMonad = new Monad[Option] {
 }
 ```
 
-Part of the reason for this is that name `flatMap` has special significance in
-scala, as for-comprehensions rely on this method to chain together operations
-in a monadic context.
-
-```tut:book
-import scala.reflect.runtime.universe
 
-universe.reify(
-  for {
-    x <- Some(1)
-    y <- Some(2)
-  } yield x + y
-).tree
-```
 
 ### ifM