minor doc update for making it more windows-friendly

docs/intro/overview.rst

@@ -152,7 +152,7 @@ extracted item into a file using `pickle`_::
     class StoreItemPipeline(object):
         def process_item(self, domain, response, item):
             torrent_id = item.url.split('/')[-1]
-            f = open("/tmp/torrent-%s" % torrent_id, "w")
+            f = open("torrent-%s.pickle" % torrent_id, "w")
             pickle.dump(item, f)
             f.close()
 

docs/topics/settings.rst

@@ -48,17 +48,22 @@ You can also override one (or more) settings from command line using the
 
 Example::
 
-    scrapy-ctl.py crawl domain.com --set=LOG_FILE:/tmp/scrapy.log
+    scrapy-ctl.py crawl domain.com --set LOG_FILE=scrapy.log
 
 2. Environment variables
 ------------------------
 
 You can populate settings using environment variables prefixed with
-``SCRAPY_``. For example, to change the log file location::
+``SCRAPY_``. For example, to change the log file location un Unix systems::
 
-    $ export SCRAPY_LOG_FILE=/tmp/scrapy.log
+    $ export SCRAPY_LOG_FILE=scrapy.log
     $ scrapy-ctl.py crawl example.com
 
+In Windows systems, you can change the environment variables from the Control
+Panel following `these guidelines`_.
+
+.. _these guidelines: http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sysdm_advancd_environmnt_addchange_variable.mspx
+
 3. scrapy_settings
 ------------------