Doc: Fix incorrect filename references (#20277)

Minor typo corrections. I changed the filenames in the example folder structure instead of the later references to be consistent with the other examples in the documentation.

docs/apache-airflow/modules_management.rst

@@ -103,8 +103,8 @@ This is an example structure that you might have in your ``dags`` folder:
                  |
                  | my_custom_dags
                                  | __init__.py
-                                 | my_dag_1.py
-                                 | my_dag_2.py
+                                 | my_dag1.py
+                                 | my_dag2.py
                                  | base_dag.py
 
 In the case above, there are the ways you could import the python files:
@@ -123,7 +123,7 @@ shared code in the other folders, not the actual DAGs).
 
 In the example above the dags are only in ``my_custom_dags`` folder, the ``common_package`` should not be
 scanned by scheduler when searching for DAGS, so we should ignore ``common_package`` folder. You also
-want to ignore the ``base_dag`` if you keep a base DAG there that ``my_dag1.py`` and ``my_dag1.py`` derives
+want to ignore the ``base_dag.py`` if you keep a base DAG there that ``my_dag1.py`` and ``my_dag2.py`` derives
 from. Your ``.airflowignore`` should look then like this:
 
 .. code-block:: none
@@ -186,7 +186,7 @@ You should import such shared dag using full path (starting from the directory w
 
 The relative imports are counter-intuitive, and depending on how you start your python code, they can behave
 differently. In Airflow the same DAG file might be parsed in different contexts (by schedulers, by workers
-or during tests) and in those cases, relatives imports might behave differently. Always use full
+or during tests) and in those cases, relative imports might behave differently. Always use full
 python package paths when you import anything in Airflow DAGs, this will save you a lot of troubles.
 You can read more about relative import caveats in
 `this Stack Overflow thread <https://stackoverflow.com/q/16981921/516701>`_.