Fix helm chart NOTES.txt to show correct URL

[okue]

What happened

Airflow Webserver URL is incorrect shown by helm install/upgrade.

https://helm.sh/docs/chart_template_guide/notes_files/

How to reproduce

values.yaml:

ingress:
  web:
    enabled: true
    annotations: {}
    path: "/path"
    pathType: "ImplementationSpecific"
    hosts:
     - name: "localhost"
       tls:
         enabled: false
         secretName: ""

breeze k8s deploy-airflow --upgrade results is

What you think should happen instead

Airflow Webserver:
      http:////

should be

Airflow Webserver:
      http://localhost/path/

Modifications in this PR

• Fix NOTES.txt

Result

---

^ Add meaningful description above

Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an 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 a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[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/main/CONTRIBUTING.rst)
Here are some useful points:

• Pay attention to the quality of your code (flake8, mypy 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.
• Please follow ASF Code of Conduct for all communication including (but not limited to) comments on Pull Requests, Mailing list and Slack.
• Be sure to read the Airflow Coding style.
  Apache Airflow is a community-driven project and together we are making it better 🚀.
  In case of doubts contact the developers at:
  Mailing List: dev@airflow.apache.org
  Slack: https://s.apache.org/airflow-slack

[okue]

@dstandish @jedcunningham could you please review? 🙇

[potiuk]

Looks good to me.

[boring-cyborg]

Awesome work, congrats on your first merged pull request!