Upgrade instructions for the helm upgrade command points to the users Git project and DAG directory

[dmarcus-wire]

The current instructions point to this project and dags folder, where I would not host my dags
--set dags.gitSync.repo=https://github.com/opendatahub-io-contrib/airflow-on-openshift.git
--set dags.gitSync.branch=main
--set dags.gitSync.subPath=dags

Propose variables or documentation on how to point the deployment to the users and
--set dags.gitSync.repo=https://github.com/<YOUR_NAME>/<YOUR_REPOSITORY>.git
--set dags.gitSync.branch=main
--set dags.gitSync.subPath=<YOUR_PATH>/<YOUR_DAGS_DIRECTORY>

[codekow]

@dmarcus-wire Want to do a PR for the current docs with your idea?