OSDOCS#10394: Added machine pool tagging instructions to the docs

[EricPonvelle]

Version(s): enterprise-4.15+

Issue:

• OSDOCS-10394
• OSDOCS-10030

Link to docs preview:

• rosa create machinepool updates

QE review:

• [ ] QE has approved this change.

Additional information: This PR adds information about tagging machine pools on clusters. It is applicable for both ROSA Classic and ROSA with HCP.

[ocpdocs-previewbot]

🤖 Thu May 09 19:28:38 - Prow CI generated the docs preview:

https://75741--ocpdocs-pr.netlify.app/openshift-rosa/latest/cli_reference/rosa_cli/rosa-manage-objects-cli.html

[openshift-ci[bot]]

@EricPonvelle: all tests passed!

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[EricPonvelle]

This PR will be completed with #74172