Fix docs

These comments were preventing the fdOpen documentation from being
shown in Node.FS.{Async,Sync}. This should eventually be addressed in
the compiler, but this will do for now.

Author: hdgarrood

docs/Node/FS/Async.md

@@ -199,6 +199,9 @@ Check if the path exists.
 fdOpen :: forall eff. FilePath -> FileFlags -> Maybe FileMode -> Callback eff FileDescriptor -> Eff (fs :: FS | eff) Unit
 ```
 
+Open a file asynchronously. See the [Node Documentation](https://nodejs.org/api/fs.html#fs_fs_open_path_flags_mode_callback)
+for details.
+
 #### `fdRead`
 
 ``` purescript

docs/Node/FS/Sync.md

@@ -191,6 +191,9 @@ Check if the path exists.
 fdOpen :: forall eff. FilePath -> FileFlags -> Maybe FileMode -> Eff (err :: EXCEPTION, fs :: FS | eff) FileDescriptor
 ```
 
+Open a file synchronously. See the [Node documentation](http://nodejs.org/api/fs.html#fs_fs_opensync_path_flags_mode)
+for details.
+
 #### `fdRead`
 
 ``` purescript

src/Node/FS/Async.purs

@@ -297,9 +297,6 @@ exists :: forall eff. FilePath
 exists file cb = mkEff $ \_ -> runFn2
   fs.exists file $ \b -> runPure (unsafeInterleaveEff (cb b))
 
-
-{- Asynchronous File Descriptor Functions -}
-
 -- | Open a file asynchronously. See the [Node Documentation](https://nodejs.org/api/fs.html#fs_fs_open_path_flags_mode_callback)
 -- | for details.
 fdOpen :: forall eff.

src/Node/FS/Sync.purs

@@ -258,8 +258,6 @@ exists :: forall eff. FilePath
                    -> Eff (fs :: FS | eff) Boolean
 exists file = return $ fs.existsSync file
 
-{- Synchronous File Descriptor Functions -}
-
 -- | Open a file synchronously. See the [Node documentation](http://nodejs.org/api/fs.html#fs_fs_opensync_path_flags_mode)
 -- | for details.
 fdOpen :: forall eff.