RISC-V: rework comments in ISA string parser

I have found these comments to not be at all helpful whenever I look at
the parser. Further, the comments in the default case (single letter
parser) are not quite right either.
Group the comments into a larger one at the start of each case, that
attempts to explain things at a higher level.

Reviewed-by: Andrew Jones <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/20230607-headpiece-tannery-83ed5cc4856a@spud
Signed-off-by: Palmer Dabbelt <[email protected]>

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