RISC-V: doc: Updated status and clarification

Some extensions are ratified at least on the ISA specification version
20240411.  This commit moves such extensions.

This commit also changes that:

1.  Lower indentation of "Zk*" and "Zbk*" extensions to avoid extension
    groups from being misleading inside this section.
2.  Raise indentation of "Zfhmin" and "Zhinxmin" extensions to show that
    they are a strict subset of "Zfh" and "Zhinx" (respectively).
3.  Clarify that "s" is not an extension but a feature notifying
    the existence of the supervisor-level ISA.
4.  Clarify that "h" is not just an existence of the hypervisor-level ISA
    but is also an extension name ("H").

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