Patch readme errors

[gartov]

Existing Issue

Fixes # .

Why do we need this PR?

Changes proposed in this pull request

Contributor Checklist

• Which branch are you merging into? -- into "master"
  • master is for changes related to the current release of the concourse/concourse:latest image and should be good to publish immediately
  • dev is for changes related to the next release of Concourse (aka unpublished code on master in concourse/concourse)

Reviewer Checklist

This section is intended for the core maintainers only, to track review progress. Please do not
fill out this section.

• Code reviewed
• Topgun tests run
• Back-port if needed
• Is the correct branch targeted? (master or dev)

Clean up language around how Concourse reads some values directly from secrets. These arguments do not have to be explicitly passed into Concourse.
Add 'local-userssecret example. Needed to which secret should contain thelocal-users` data.
Fixed name of setting example, from "class" to "storageClass"

[xtremerui]

Hi could you rebase, fix the DCO status check error and maby adding a bit of description of the change? Thank you!