some minor updates to doc

docs/experimental/newitem.rst

@@ -29,7 +29,7 @@ Or you can use your own class to represent items, just be sure it inherits from
 More advanced items
 ===================
 
-.. class:: scrapy.contrib_exp.newitem.Item(ScrapedItem)
+.. class:: scrapy.contrib_exp.newitem.Item
 
 Scrapy provides :class:`~scrapy.contrib_exp.newitem.Item` (a subclass of
 :class:`~scrapy.item.ScrapedItem`) that works like a form with fields to store

docs/ref/index.rst

@@ -20,3 +20,5 @@ This section documents the Scrapy |version| API. For more information see :ref:`
    extensions
    downloader-middleware
    link-extractors
+
+* :ref:`topics-stats-api`

docs/topics/stats.rst

@@ -4,6 +4,9 @@
 Stats Collector
 ===============
 
+Overview
+========
+
 Scrapy provides a convenient facility for collecting stats in the form of
 key/values, both globally and per spider/domain. It's called the Stats
 Collector, and it's a singleton which can be imported and used quickly, as
@@ -75,6 +78,8 @@ Get all stats from a given domain::
     >>> stats.get_stats('pages_crawled', domain='example.com')
     {'pages_crawled': 1238, 'start_time': datetime.datetime(2009, 7, 14, 21, 47, 28, 977139)}
 
+.. _topics-stats-api:
+
 Stats Collector API
 ===================