fixed mardown formatting of ListView

Summary:
about renderRow and renderSeparator.
insert a new line before description.
Closes https://github.com/facebook/react-native/pull/4532

Reviewed By: svcscm

Differential Revision: D2718764

Pulled By: androidtrunkagent

fb-gh-sync-id: eeefd16617fcb5e5ca21f6fd0cf29d63cb3b1f1c

Libraries/CustomComponents/ListView/ListView.js

@@ -116,6 +116,7 @@ var ListView = React.createClass({
     dataSource: PropTypes.instanceOf(ListViewDataSource).isRequired,
     /**
      * (sectionID, rowID, adjacentRowHighlighted) => renderable
+     *
      * If provided, a renderable component to be rendered as the separator
      * below each row but not the last row if there is a section header below.
      * Take a sectionID and rowID of the row above and whether its adjacent row
@@ -124,6 +125,7 @@ var ListView = React.createClass({
     renderSeparator: PropTypes.func,
     /**
      * (rowData, sectionID, rowID, highlightRow) => renderable
+     *
      * Takes a data entry from the data source and its ids and should return
      * a renderable component to be rendered as the row.  By default the data
      * is exactly what was put into the data source, but it's also possible to