fix grammar error

[suryapandian]

What this PR does / why we need it:

Noticed this https://github.com/fluxcd-community/helm-charts/pull/163/files and fixed DCO,signing and similar issues in other places.

Special notes for your reviewer:

Checklist

• [x] DCO signed
• [x] Chart Version bumped
• [x] helm-docs are updated
• [x] Helm chart is tested
• [x] Update artifacthub.io/changes in Chart.yaml
• [x] Run make reviewable

[stefanprodan]

superseded by #202