mssql-doc updated with the list of tables which should have permission

[ManojS-shetty]

What does this PR do?

This PR is a update for MSSQL module document with additional information like permission required for the list of tables.

Why is it important?

These information are needed for the users to know about prerequisites.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
  - [ ] I have made corresponding change to the default configuration files
  - [ ] I have added tests that prove my fix is effective or that my feature works
  - [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

• [NA]

How to test this PR locally

NA

Related issues

• Closes [Metricbeat] Update MSSQL docs #12267.
• Closes [Metricbeat][MSSQL] Docs clarifications for credentials and permissions #13006.

Use cases

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Logs

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[mergify]

This pull request does not have a backport label. Could you fix it @ManojS-shetty? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

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• Reason: null

• Start Time: 2022-02-01T13:29:17.622+0000

• Duration: 24 min 11 sec

• Commit: 22e9cca

❕ Flaky test report

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[sayden]

LGTM 🙂