Tutorial docs: fix bash_command example to avoid Jinja template not found

[eladkal]

closes: #8999

The tutorial explains how to use Jinja templating with BashOperator.
Executing the command as in the tutorial will raise Jinja template not found error.
The reason for this explained at length in the troubleshooting section of BashOperator.

I chose not to add explanation why the space is needed because this is a tutorial to templating with Jinja and not to BashOperator. Users who go over it might not use bash again so there is no need to trouble them with why this space is required.

[kaxil]

This is incorrect. As explained in the docs itself if the file is relative to jinja searchpath it works out of the box and does not require any space.

Check the description:

https://github.com/apache/airflow/blob/568327f01a39d6f181dda62ef6a143f5096e6b97/airflow/models/dag.py#L142:L146

The tutorial clearly mentions that file path is relative to dag

[eladkal]

double checked. You are correct.
closing