Update mount-block-device.rst

[ismailkayi]

1- Missing sudo command added. (https://github.com/canonical/microceph/issues/404) 2 - Steps have been added for the issue : https://github.com/canonical/microceph/issues/406

Description

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Fixes # (issue)

Type of change

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• [x] Documentation update (Doc only change)

How Has This Been Tested?

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Contributor's Checklist

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• [x] updated the user documentation with corresponding changes.

[UtkarshBhatthere]

lgtm, although I'm wondering if it wouldn't also be possible to specify the ceph.conf path to the specific commands instead of using a symbolic link

Yes we can, infact that is what the document does at the moment. I still feel that having a symlink there could be good. (we have plans to do the symlinking automatically from inside microceph soon).

[UtkarshBhatthere]

@ismailkayi please sign your commits using a GPG key. ref. This is required for all contributions to be accepted for MicroCeph (check failing CI test)