Fix broken doc links.

All generated template files contain broken link to doc files.

scrapy/templates/project/module/items.py.tmpl

@@ -1,7 +1,7 @@
 # Define here the models for your scraped items
 #
 # See documentation in:
-# http://doc.scrapy.org/topics/items.html
+# http://doc.scrapy.org/en/latest/topics/items.html
 
 from scrapy.item import Item, Field
 

scrapy/templates/project/module/pipelines.py.tmpl

@@ -1,7 +1,7 @@
 # Define your item pipelines here
 #
 # Don't forget to add your pipeline to the ITEM_PIPELINES setting
-# See: http://doc.scrapy.org/topics/item-pipeline.html
+# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html
 
 class ${ProjectName}Pipeline(object):
     def process_item(self, item, spider):

scrapy/templates/project/module/settings.py.tmpl

@@ -3,7 +3,7 @@
 # For simplicity, this file contains only the most important settings by
 # default. All the other settings are documented here:
 #
-#     http://doc.scrapy.org/topics/settings.html
+#     http://doc.scrapy.org/en/latest/topics/settings.html
 #
 
 BOT_NAME = '$project_name'

scrapy/templates/project/scrapy.cfg

@@ -1,7 +1,7 @@
 # Automatically created by: scrapy startproject
 #
 # For more information about the [deploy] section see:
-# http://doc.scrapy.org/topics/scrapyd.html
+# http://doc.scrapy.org/en/latest/topics/scrapyd.html
 
 [settings]
 default = ${project_name}.settings