Remove docs mentioning deprecated spider attrs. (#7176)

docs/topics/commands.rst

@@ -163,8 +163,8 @@ information on which commands must be run from inside projects, and which not.
 
 Also keep in mind that some commands may have slightly different behaviours
 when running them from inside projects. For example, the fetch command will use
-spider-overridden behaviours (such as the ``user_agent`` attribute to override
+spider-overridden behaviours (such as the ``custom_settings`` attribute to
-the user-agent) if the url being fetched is associated with some specific
+override settings) if the url being fetched is associated with some specific
 spider. This is intentional, as the ``fetch`` command is meant to be used to
 check how spiders are downloading pages.
 

docs/topics/downloader-middleware.rst

@@ -290,13 +290,12 @@ DownloadTimeoutMiddleware
 .. class:: DownloadTimeoutMiddleware
 
     This middleware sets the download timeout for requests specified in the
-    :setting:`DOWNLOAD_TIMEOUT` setting or :attr:`download_timeout`
+    :setting:`DOWNLOAD_TIMEOUT` setting.
-    spider attribute.
 
 .. note::
 
-    You can also set download timeout per-request using
+    You can also set download timeout per-request using the
-    :reqmeta:`download_timeout` Request.meta key; this is supported
+    :reqmeta:`download_timeout` :attr:`.Request.meta` key; this is supported
     even when DownloadTimeoutMiddleware is disabled.
 
 HttpAuthMiddleware
@@ -1212,9 +1211,8 @@ UserAgentMiddleware
 
 .. class:: UserAgentMiddleware
 
-   Middleware that allows spiders to override the default user agent.
+   Middleware that sets the ``User-Agent`` header.
 
-   In order for a spider to override the default user agent, its ``user_agent``
+   The header value is taken from the :setting:`USER_AGENT` setting.
-   attribute must be set.
 
 .. _DBM: https://en.wikipedia.org/wiki/Dbm

docs/topics/settings.rst

@@ -1007,9 +1007,8 @@ The amount of time (in secs) that the downloader will wait before timing out.
 
 .. note::
 
-    This timeout can be set per spider using :attr:`download_timeout`
+    This timeout can be per-request using the :reqmeta:`download_timeout`
-    spider attribute and per-request using :reqmeta:`download_timeout`
+    :attr:`.Request.meta` key.
-    Request.meta key.
 
 .. setting:: DOWNLOAD_MAXSIZE
 .. reqmeta:: download_maxsize
@@ -1028,9 +1027,10 @@ ignored.
 
 Use ``0`` to disable this limit.
 
-This limit can be set per spider using the :attr:`download_maxsize` spider
+.. note::
-attribute and per request using the :reqmeta:`download_maxsize` Request.meta
+
-key.
+    This limit can be set per-request using the :reqmeta:`download_maxsize`
+    :attr:`.Request.meta` key.
 
 .. setting:: DOWNLOAD_WARNSIZE
 .. reqmeta:: download_warnsize
@@ -1045,9 +1045,10 @@ warning will be logged about it.
 
 Use ``0`` to disable this limit.
 
-This limit can be set per spider using the :attr:`download_warnsize` spider
+.. note::
-attribute and per request using the :reqmeta:`download_warnsize` Request.meta
+
-key.
+    This limit can be set per-request using the :reqmeta:`download_warnsize`
+    :attr:`.Request.meta` key.
 
 .. setting:: DOWNLOAD_FAIL_ON_DATALOSS
 

docs/topics/spiders.rst

@@ -355,11 +355,9 @@ Otherwise, you would cause iteration over a ``start_urls`` string
 resulting in each character being seen as a separate url.
 
 A valid use case is to set the http auth credentials
-used by :class:`~scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware`
+used by :class:`~scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware`::
-or the user agent
-used by :class:`~scrapy.downloadermiddlewares.useragent.UserAgentMiddleware`::
 
-    scrapy crawl myspider -a http_user=myuser -a http_pass=mypassword -a user_agent=mybot
+    scrapy crawl myspider -a http_user=myuser -a http_pass=mypassword
 
 Spider arguments can also be passed through the Scrapyd ``schedule.json`` API.
 See `Scrapyd documentation`_.