fix: add missing end-if in notes.txt

[gabor-boros]

The NOTES.txt currently missing a closing end for an if statement in the Go template, making it broken and preventing the helm chart to be installed. This PR adds the missing {{ end }} to close the initial {{ if and .Values.prometheusstack.grafana.enabled ... }} statement.

To check the issue, run the following: https://go.dev/play/p/dakeHH1Mrq5 Then to check the fix: https://go.dev/play/p/APXiGU29pci

The difference between the two is the above-mentioned closing tag.

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Thanks for the pull request, @gabor-boros! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

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