[AIRFLOW-XXXX] Fix typo in error when getting dataflow jobs

[JonnyDaenen]

Correction of small typo in error when getting GCP Dataflow jobs.

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Issue link: Document only change, no JIRA issue

Make sure to mark the boxes below before creating PR: [x]

• Description above provides context of the change
• Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• Unit tests coverage for changes (not needed for documentation changes)
• Commits follow "How to write a good git commit message"
• Relevant documentation is updated including usage instructions.
• I will engage committers as explained in Contribution Workflow Example.

^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.
Read the Pull Request Guidelines for more information.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst)
Here are some useful points:

• Pay attention to the quality of your code (flake8, pylint and type annotations). Our pre-commits will help you with that.
• In case of a new feature add useful documentation (in docstrings or in docs/ directory). Adding a new operator? Check this short guide Consider adding an example DAG that shows how users should use it.
• Consider using Breeze environment for testing locally, it’s a heavy docker but it ships with a working Airflow and a lot of integrations.
• Be patient and persistent. It might take some time to get a review or get the final approval from Committers.
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  In case of doubts contact the developers at:
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[JonnyDaenen]

Is there a way to easily change the commit message without creating a new fork/commit?
Also, how should I improve my commit message?

[mik-laj]

You can also create a second commit using Github' Web UI. Then the warning will disappear. You should add "[JIRA-NNNN]" prefix to commit message.

[codecov-io]

Codecov Report

Merging #7260 into master will decrease coverage by 0.27%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #7260      +/-   ##
==========================================
- Coverage   85.33%   85.05%   -0.28%     
==========================================
  Files         791      791              
  Lines       40137    40137              
==========================================
- Hits        34251    34140     -111     
- Misses       5886     5997     +111

Impacted Files	Coverage Δ
airflow/gcp/hooks/dataflow.py	88.37% <0%> (ø)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...viders/cncf/kubernetes/operators/kubernetes_pod.py	76.47% <0%> (-21.18%)	⬇️
airflow/jobs/backfill_job.py	91.88% <0%> (+0.28%)	⬆️

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[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[potiuk]

Thanks @JonnyDaenen ! Just next time make sure the PR has [AIRFLOW-XXXX] prefix :)