diff --git a/docs/conf.py b/docs/conf.py
index eab366efd..914d1d05f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -275,6 +275,7 @@ coverage_ignore_pyobjects = [
 # -------------------------------------
 
 intersphinx_mapping = {
+    'coverage': ('https://coverage.readthedocs.io/en/stable', None),
     'pytest': ('https://docs.pytest.org/en/latest', None),
     'python': ('https://docs.python.org/3', None),
     'sphinx': ('https://www.sphinx-doc.org/en/master', None),
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 81bb50a77..234c4bcee 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -243,14 +243,13 @@ the Python 3.6 :doc:`tox <tox:index>` environment using all your CPU cores::
 
     tox -e py36 -- scrapy tests -n auto
 
-To see coverage report install `coverage`_ (``pip install coverage``) and run:
+To see coverage report install :doc:`coverage <coverage:index>`
+(``pip install coverage``) and run:
 
     ``coverage report``
 
 see output of ``coverage --help`` for more options like html or xml report.
 
-.. _coverage: https://pypi.python.org/pypi/coverage
-
 Writing tests
 -------------
 
diff --git a/docs/topics/loaders.rst b/docs/topics/loaders.rst
index 81c8dab03..de3f38023 100644
--- a/docs/topics/loaders.rst
+++ b/docs/topics/loaders.rst
@@ -477,6 +477,8 @@ ItemLoader objects
     .. attribute:: item
 
         The :class:`~scrapy.item.Item` object being parsed by this Item Loader.
+        This is mostly used as a property so when attempting to override this
+        value, you may want to check out :attr:`default_item_class` first.
 
     .. attribute:: context
 
diff --git a/scrapy/crawler.py b/scrapy/crawler.py
index 41252d73e..6c7eb737b 100644
--- a/scrapy/crawler.py
+++ b/scrapy/crawler.py
@@ -1,4 +1,5 @@
 import logging
+import pprint
 import signal
 import warnings
 
@@ -45,7 +46,8 @@ class Crawler(object):
         logging.root.addHandler(handler)
 
         d = dict(overridden_settings(self.settings))
-        logger.info("Overridden settings: %(settings)r", {'settings': d})
+        logger.info("Overridden settings:\n%(settings)s",
+                    {'settings': pprint.pformat(d)})
 
         if get_scrapy_root_handler() is not None:
             # scrapy root handler already installed: update it with new settings
diff --git a/scrapy/downloadermiddlewares/cookies.py b/scrapy/downloadermiddlewares/cookies.py
index 9deba40d6..d8dabdf13 100644
--- a/scrapy/downloadermiddlewares/cookies.py
+++ b/scrapy/downloadermiddlewares/cookies.py
@@ -1,4 +1,3 @@
-import os
 import logging
 from collections import defaultdict
 
diff --git a/scrapy/downloadermiddlewares/httpcache.py b/scrapy/downloadermiddlewares/httpcache.py
index 495b103d1..4e06f8236 100644
--- a/scrapy/downloadermiddlewares/httpcache.py
+++ b/scrapy/downloadermiddlewares/httpcache.py
@@ -1,11 +1,19 @@
 from email.utils import formatdate
+
 from twisted.internet import defer
-from twisted.internet.error import TimeoutError, DNSLookupError, \
-        ConnectionRefusedError, ConnectionDone, ConnectError, \
-        ConnectionLost, TCPTimedOutError
+from twisted.internet.error import (
+    ConnectError,
+    ConnectionDone,
+    ConnectionLost,
+    ConnectionRefusedError,
+    DNSLookupError,
+    TCPTimedOutError,
+    TimeoutError,
+)
 from twisted.web.client import ResponseFailed
+
 from scrapy import signals
-from scrapy.exceptions import NotConfigured, IgnoreRequest
+from scrapy.exceptions import IgnoreRequest, NotConfigured
 from scrapy.utils.misc import load_object