Update Maintenance.md

[Corey-666]

Moved the description of the procedure from the end to the beginning of the article.

Description

• Doc update

Fixes # (issue)

Solution

• Moved the description of the procedure from the end to the beginning of the article.

How to apply

Provide steps how to apply on top previous Kubemarine version to execute on existing clusters

• Install task/s
• Manual step
• Upgrade procedure

Test Cases

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

TestCase 1

Test Configuration:

• Hardware:
• OS:
• Inventory:

Steps:

Results:

Before	After

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Integration CI passed
• Unit tests. If Yes list of new/changed tests with brief description
• There is no merge conflicts

Unit tests

Indicate new or changed unit tests and what they do, if any.