doc/radosgw: Small improvements in cloud-restore.rst

doc/radosgw: Small improvements in cloud-restore.rst

Add a label in file cloud-transition.rst for linking to it.
Change a link using full URL of Ceph docs to use :ref: and said label.

Indent text in unordered lists so that they are rendered as list items.

Use consistently double backticks for references to configuration
values.

Change one external link pointing to old v1 of AWS CLI to the
recommended v2 docs.

Change another external link pointing to old v1 of AWS CLI to the
current AWS API doc instead and add link text instead of rendering the
whole URL.
However, both the old and the new text (which are the same) do not
currently seem to explicitly confirm the claim "storage class of
restored objects should remain unchanged".

Change one CLI command prompt to privileged prompt because it uses
radosgw-admin.

Use "lifecycle" consistently instead of "Life Cycle" in one place and
put the acronym "LC" inside parenthesis instead of the full spelling.

Fix typo "Th" into "The".

Use admonitions instead of spelling out "Note: [...]".

Small improvement to language in one admonition.

Signed-off-by: Ville Ojamo <14869000+bluikko@users.noreply.github.com>