docs: Fix some spelling errors.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

docs/overview/changelog.md

@@ -82,7 +82,7 @@ in bursts.
 
 - Removed unused `short_name` field from the User model.  This field
   had no purpose and could leak the local part of email addresses
-  when email address visiblity was restricted.
+  when email address visibility was restricted.
 - Fixed a bug where loading spinners would sometimes not be displayed.
 - Fixed incoming email gateway exception with unstructured headers.
 - Fixed AlertWords not being included in data import/export.

docs/tutorials/screenshot-and-gif-software.md

@@ -1,6 +1,6 @@
 # Screenshot and GIF software
 
-The following list documents different screenshoting & GIF-making techniques and
+The following list documents different screenshotting & GIF-making techniques and
 free software. We encourage you to make use of these when making front-end pull
 requests, as other contributors can see the changes you have made without having
 to check out your branch.
@@ -9,7 +9,7 @@ to check out your branch.
 ### Browser
 - Firefox can take screenshots without any plugins (stable feature starting from v57)
     - You can find it under `page actions / Take a screenshot`
-    - It is capable of screenshoting the entire page, visible area and individual DOM elements
+    - It is capable of screenshotting the entire page, visible area and individual DOM elements
 - [LightShot Screenshot](https://app.prntscr.com/en/index.html) (Chrome, Firefox, IE & Opera)
 
 ### macOS

zerver/lib/send_email.py

@@ -245,7 +245,7 @@ def clear_scheduled_emails(user_ids: List[int], email_type: Optional[int]=None)
     for item in deduplicated_items.values():
         # Now we want a FOR UPDATE lock on the item.users rows
         # to prevent a concurrent transaction from mutating them
-        # simultanously.
+        # simultaneously.
         item.users.all().select_for_update()
         item.users.remove(*user_ids)
         if item.users.all().count() == 0:

zerver/tests/test_markdown.py

@@ -1098,9 +1098,9 @@ class MarkdownTest(ZulipTestCase):
         converted_topic = topic_links(realm.id, msg.topic_name())
 
         # The second filter (which was saved later) was ignored as the content was marked AtomicString after first conversion.
-        # There was no easy way to support parsing both filters and not run into an infinite loop, hence the sencond filter is ignored.
+        # There was no easy way to support parsing both filters and not run into an infinite loop, hence the second filter is ignored.
         self.assertEqual(converted, '<p>We should fix <a href="https://trac.example.com/ticket/ABC-123">ABC-123</a> or <a href="https://trac.example.com/ticket/16">trac ABC-123</a> today.</p>')
-        # Both the links should be genered in topics.
+        # Both the links should be generated in topics.
         self.assertEqual(converted_topic, ['https://trac.example.com/ticket/ABC-123', 'https://other-trac.example.com/ticket/ABC-123'])
 
     def test_maybe_update_markdown_engines(self) -> None:

zerver/worker/queue_processors.py

@@ -668,7 +668,7 @@ class MirrorWorker(QueueProcessingWorker):
 
 @assign_queue('embed_links')
 class FetchLinksEmbedData(QueueProcessingWorker):
-    # This is a slow queue with network requests, so a disk write is neglible.
+    # This is a slow queue with network requests, so a disk write is negligible.
     # Update stats file after every consume call.
     CONSUME_ITERATIONS_BEFORE_UPDATE_STATS_NUM = 1
 
@@ -866,7 +866,7 @@ class TestWorker(QueueProcessingWorker):
 
 @assign_queue('noop', queue_type="test")
 class NoopWorker(QueueProcessingWorker):
-    """Used to profile the queue procesing framework, in zilencer's queue_rate."""
+    """Used to profile the queue processing framework, in zilencer's queue_rate."""
 
     def __init__(self, max_consume: int=1000, slow_queries: Optional[List[int]]=None) -> None:
         self.consumed = 0
@@ -884,7 +884,7 @@ class NoopWorker(QueueProcessingWorker):
 
 @assign_queue('noop_batch', queue_type="test")
 class BatchNoopWorker(LoopQueueProcessingWorker):
-    """Used to profile the queue procesing framework, in zilencer's queue_rate."""
+    """Used to profile the queue processing framework, in zilencer's queue_rate."""
     batch_size = 500
 
     def __init__(self, max_consume: int=1000, slow_queries: Optional[List[int]]=None) -> None: