Merge pull request scrapy#362 from hmsimha/0.16

Scrapy 0.16 Overview doc issues: class definition name, and bad XPath description

Author: dangra

docs/intro/overview.rst

@@ -45,7 +45,7 @@ This would be our Item::
 
     from scrapy.item import Item, Field
 
-    class Torrent(Item):
+    class TorrentItem(Item):
         url = Field()
         name = Field()
         description = Field()
@@ -125,7 +125,7 @@ tag with ``id=specifications``::
 
 .. highlight:: none
 
-An XPath expression to select the description could be::
+An XPath expression to select the file size could be::
 
    //div[@id='specifications']/p[2]/text()[2]