diff --git a/scrapy/core/scheduler.py b/scrapy/core/scheduler.py
index d807fe347..82e31b90b 100644
--- a/scrapy/core/scheduler.py
+++ b/scrapy/core/scheduler.py
@@ -131,10 +131,10 @@ class Scheduler(BaseScheduler):
     (:setting:`SCHEDULER_PRIORITY_QUEUE`) that sort requests by
     :attr:`~scrapy.http.Request.priority`.
 
-    By default, a single, memory-based priority queue is used for all requests.
-    When using :setting:`JOBDIR`, a disk-based priority queue is also created,
+    By default, memory-based priority queues are used for all requests.
+    When using :setting:`JOBDIR`, disk-based priority queues are also created,
     and only unserializable requests are stored in the memory-based priority
-    queue. For a given priority value, requests in memory take precedence over
+    queues. For a given priority value, requests in memory take precedence over
     requests in disk.
 
     Each priority queue stores requests in separate internal queues, one per
@@ -342,7 +342,7 @@ class Scheduler(BaseScheduler):
     def open(self, spider: Spider) -> Deferred[None] | None:
         """
         (1) initialize the memory queue
-        (2) initialize the disk queue if the ``jobdir`` attribute is a valid directory
+        (2) initialize the disk queue if the ``jobdir`` argument wasn't empty
         (3) return the result of the dupefilter's ``open`` method
         """
         self.spider: Spider = spider
diff --git a/scrapy/downloadermiddlewares/retry.py b/scrapy/downloadermiddlewares/retry.py
index 5f125cae4..ac5651dc7 100644
--- a/scrapy/downloadermiddlewares/retry.py
+++ b/scrapy/downloadermiddlewares/retry.py
@@ -5,9 +5,6 @@ problems such as a connection timeout or HTTP 500 error.
 You can change the behaviour of this middleware by modifying the scraping settings:
 RETRY_TIMES - how many times to retry a failed page
 RETRY_HTTP_CODES - which HTTP response codes to retry
-
-Failed pages are collected on the scraping process and rescheduled at the end,
-once the spider has finished crawling all regular (non-failed) pages.
 """
 
 from __future__ import annotations
diff --git a/scrapy/pqueues.py b/scrapy/pqueues.py
index 2efc43d4b..41411ceaf 100644
--- a/scrapy/pqueues.py
+++ b/scrapy/pqueues.py
@@ -92,9 +92,10 @@ class ScrapyPriorityQueue:
     -   The :data:`~scrapy.Request.priority` of the request.
 
     For each combination of the above seen, this class creates an instance of
-    *downstream_queue_cls* with *key* set to a subdirectory of the persistence
-    directory, named as the request priority (e.g. ``1``), with an ``s`` suffix
-    in case of a start request (e.g. ``1s``).
+    *downstream_queue_cls* (or *start_queue_cls* for start requests if it was
+    passed) with *key* set to a subdirectory of the persistence directory,
+    named as the negated request priority (e.g. ``-1``), with an ``s`` suffix
+    in case of a start request (e.g. ``-1s``).
     """
 
     @classmethod