Updated upgrade docs with a note

[jashaik]

Signed-off-by: jan shahid shaik jashaik@progress.com

Description

[Please describe what this change achieves]
Updated upgrades.md for adding a note for reindex operation

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or
StackOverflow discussions that are relevant]
in this PR

Check List

• New functionality includes tests
• All buildkite tests pass
• Full omnibus build and tests in buildkite pass
• All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/main/CONTRIBUTING.md#developer-certification-of-origin-dco
• PR title is a worthy inclusion in the CHANGELOG

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