Mention about .sh commands and templates in BashOperator docs (#11566)

airflow/operators/bash.py

@@ -62,6 +62,13 @@ class BashOperator(BaseOperator):
 
         bash_command = "set -e; python3 script.py '{{ next_execution_date }}'"
 
+    .. note::
+
+        Add a space after the script name when directly calling a ``.sh`` script with the
+        ``bash_command`` argument -- for example ``bash_command="my_script.sh "``.  This
+        is because Airflow tries to apply load this file and process it as a Jinja template to
+        it ends with ``.sh``, which will likely not be what most users want.
+
     .. warning::
 
         Care should be taken with "user" input or when using Jinja templates in the