Remove reference to undead tasks from documentation

docs/apache-airflow/core-concepts/tasks.rst

@@ -167,25 +167,22 @@ These can be useful if your code has extra knowledge about its environment and w
 
 .. _concepts:zombies:
 
-Zombie/Undead Tasks
--------------------
+Zombie Tasks
+------------
 
-No system runs perfectly, and task instances are expected to die once in a while. Airflow detects two kinds of task/process mismatch:
+No system runs perfectly, and task instances are expected to die once in a while.
 
-* *Zombie tasks* are ``TaskInstances`` stuck in a ``running`` state despite their associated jobs being inactive
-  (e.g. their process did not send a recent heartbeat as it got killed, or the machine died). Airflow will find these
-  periodically, clean them up, and either fail or retry the task depending on its settings. Tasks can become zombies for
-  many reasons, including:
+*Zombie tasks* are ``TaskInstances`` stuck in a ``running`` state despite their associated jobs being inactive
+(e.g. their process did not send a recent heartbeat as it got killed, or the machine died). Airflow will find these
+periodically, clean them up, and either fail or retry the task depending on its settings. Tasks can become zombies for
+many reasons, including:
 
-    * The Airflow worker ran out of memory and was OOMKilled.
-    * The Airflow worker failed its liveness probe, so the system (for example, Kubernetes) restarted the worker.
-    * The system (for example, Kubernetes) scaled down and moved an Airflow worker from one node to another.
+* The Airflow worker ran out of memory and was OOMKilled.
+* The Airflow worker failed its liveness probe, so the system (for example, Kubernetes) restarted the worker.
+* The system (for example, Kubernetes) scaled down and moved an Airflow worker from one node to another.
 
-* *Undead tasks* are tasks that are *not* supposed to be running but are, often caused when you manually edit Task
-  Instances via the UI. Airflow will find them periodically and terminate them.
 
-
-Below is the code snippet from the Airflow scheduler that runs periodically to detect zombie/undead tasks.
+Below is the code snippet from the Airflow scheduler that runs periodically to detect zombie tasks.
 
 .. exampleinclude:: /../../airflow/jobs/scheduler_job_runner.py
     :language: python

docs/apache-airflow/redirects.txt

@@ -172,3 +172,6 @@ howto/define_extra_link.rst howto/define-extra-link.rst
 
 # Use test config (it's not a howto for users but a howto for developers so we redirect it back to index)
 howto/use-test-config.rst index.rst
+
+# Removing reference to undead tasks
+core-concepts/tasks.html#zombie-undead-tasks core-concepts/tasks.html#zombie-tasks