Fix mistake and typos in doc/docstrings (#15180)

- Fix an apparent mistake in doc relating to catchup
- Fix typo pickable (should be picklable)

airflow/providers/apache/hive/hooks/hive.py

@@ -483,7 +483,7 @@ def __init__(self, metastore_conn_id: str = default_conn_name) -> None:
 
     def __getstate__(self) -> Dict[str, Any]:
         # This is for pickling to work despite the thrift hive client not
-        # being pickable
+        # being picklable
         state = dict(self.__dict__)
         del state['metastore']
         return state

airflow/utils/timezone.py

@@ -56,7 +56,7 @@ def utcnow() -> dt.datetime:
     :return:
     """
     # pendulum utcnow() is not used as that sets a TimezoneInfo object
-    # instead of a Timezone. This is not pickable and also creates issues
+    # instead of a Timezone. This is not picklable and also creates issues
     # when using replace()
     result = dt.datetime.utcnow()
     result = result.replace(tzinfo=utc)
@@ -71,7 +71,7 @@ def utc_epoch() -> dt.datetime:
     :return:
     """
     # pendulum utcnow() is not used as that sets a TimezoneInfo object
-    # instead of a Timezone. This is not pickable and also creates issues
+    # instead of a Timezone. This is not picklable and also creates issues
     # when using replace()
     result = dt.datetime(1970, 1, 1)
     result = result.replace(tzinfo=utc)

docs/apache-airflow/dag-run.rst

@@ -80,7 +80,7 @@ An Airflow DAG with a ``start_date``, possibly an ``end_date``, and a ``sched
 series of intervals which the scheduler turns into individual DAG Runs and executes. The scheduler, by default, will
 kick off a DAG Run for any interval that has not been run since the last execution date (or has been cleared). This concept is called Catchup.
 
-If your DAG is written to handle its catchup (i.e., not limited to the interval, but instead to ``Now`` for instance.),
+If your DAG is not written to handle its catchup (i.e., not limited to the interval, but instead to ``Now`` for instance.),
 then you will want to turn catchup off. This can be done by setting ``catchup = False`` in DAG  or ``catchup_by_default = False``
 in the configuration file. When turned off, the scheduler creates a DAG run only for the latest interval.