diff --git a/scrapy/addons.py b/scrapy/addons.py
index 2e12f8c8a..470be47c1 100644
--- a/scrapy/addons.py
+++ b/scrapy/addons.py
@@ -64,7 +64,7 @@ class AddonManager:
 
         :param settings: The :class:`~scrapy.settings.BaseSettings` object from \
             which to read the early add-on configuration
-        :type settings: :class:`~scrapy.settings.Settings`
+        :type settings: :class:`~scrapy.settings.BaseSettings`
         """
         for clspath in build_component_list(settings["ADDONS"]):
             addoncls = load_object(clspath)
diff --git a/scrapy/core/downloader/handlers/ftp.py b/scrapy/core/downloader/handlers/ftp.py
index 9064aa53a..07ff4a74e 100644
--- a/scrapy/core/downloader/handlers/ftp.py
+++ b/scrapy/core/downloader/handlers/ftp.py
@@ -2,9 +2,9 @@
 An asynchronous FTP file download handler for scrapy which somehow emulates an http response.
 
 FTP connection parameters are passed using the request meta field:
-- ftp_user (required)
-- ftp_password (required)
-- ftp_passive (by default, enabled) sets FTP connection passive mode
+- ftp_user (optional, falls back to FTP_USER)
+- ftp_password (optional, falls back to FTP_PASSWORD)
+- ftp_passive (optional, falls back to FTP_PASSIVE_MODE) sets FTP connection passive mode
 - ftp_local_filename
         - If not given, file data will come in the response.body, as a normal scrapy Response,
         which will imply that the entire file will be on memory.
diff --git a/scrapy/downloadermiddlewares/httpcompression.py b/scrapy/downloadermiddlewares/httpcompression.py
index 2b1721ced..6ca04a50e 100644
--- a/scrapy/downloadermiddlewares/httpcompression.py
+++ b/scrapy/downloadermiddlewares/httpcompression.py
@@ -60,7 +60,7 @@ else:
 
 
 class HttpCompressionMiddleware:
-    """This middleware allows compressed (gzip, deflate) traffic to be
+    """This middleware allows compressed (gzip, deflate etc.) traffic to be
     sent/received from websites"""
 
     def __init__(
diff --git a/scrapy/downloadermiddlewares/retry.py b/scrapy/downloadermiddlewares/retry.py
index ac5651dc7..a0a0b60a2 100644
--- a/scrapy/downloadermiddlewares/retry.py
+++ b/scrapy/downloadermiddlewares/retry.py
@@ -67,8 +67,9 @@ def get_retry_request(
     and :ref:`stats <topics-stats>`, and to provide extra logging context (see
     :func:`logging.debug`).
 
-    *reason* is a string or an :class:`Exception` object that indicates the
-    reason why the request needs to be retried. It is used to name retry stats.
+    *reason* is a string, an :class:`Exception` subclass or an
+    :class:`Exception` object that indicates the reason why the request needs
+    to be retried. It is used to name retry stats.
 
     *max_retry_times* is a number that determines the maximum number of times
     that *request* can be retried. If not specified or ``None``, the number is
diff --git a/scrapy/extensions/throttle.py b/scrapy/extensions/throttle.py
index cdb0671ae..542ff1cdc 100644
--- a/scrapy/extensions/throttle.py
+++ b/scrapy/extensions/throttle.py
@@ -116,7 +116,7 @@ class AutoThrottle:
         # It works better with problematic sites.
         new_delay = max(target_delay, new_delay)
 
-        # Make sure self.mindelay <= new_delay <= self.max_delay
+        # Make sure self.mindelay <= new_delay <= self.maxdelay
         new_delay = min(max(self.mindelay, new_delay), self.maxdelay)
 
         # Dont adjust delay if response status != 200 and new delay is smaller
diff --git a/scrapy/shell.py b/scrapy/shell.py
index f7ec8bea0..dfea00c46 100644
--- a/scrapy/shell.py
+++ b/scrapy/shell.py
@@ -75,7 +75,7 @@ if TYPE_CHECKING:
 # running event loop.
 #
 # Side note: it should be possible to remove _request_deferred() by using
-# engine.download_async() instead of engine.schedule(), losing the usual stuff
+# engine.download_async() instead of engine.crawl(), losing the usual stuff
 # like spider middlewares (none of which should be important).
 #
 # Other architecture problems:
diff --git a/scrapy/spidermiddlewares/httperror.py b/scrapy/spidermiddlewares/httperror.py
index 94b6dfbb5..156b73e7e 100644
--- a/scrapy/spidermiddlewares/httperror.py
+++ b/scrapy/spidermiddlewares/httperror.py
@@ -28,7 +28,7 @@ logger = logging.getLogger(__name__)
 
 
 class HttpError(IgnoreRequest):
-    """A non-200 response was filtered"""
+    """A non-2xx response was filtered"""
 
     def __init__(self, response: Response, *args: Any, **kwargs: Any):
         self.response = response
diff --git a/scrapy/utils/defer.py b/scrapy/utils/defer.py
index 935ac8bc1..d0259b634 100644
--- a/scrapy/utils/defer.py
+++ b/scrapy/utils/defer.py
@@ -523,7 +523,7 @@ def maybe_deferred_to_future(d: Deferred[_T]) -> Deferred[_T] | Future[_T]:
 
             async def parse(self, response):
                 deferred = some_dfd_helper()
-                result = await deferred_to_future(deferred)
+                result = await maybe_deferred_to_future(deferred)
     """
     if not is_asyncio_available():
         return d