[edn/doc] references to register bits and fields updated
[edn/doc] references to register bits and fields updated

Matching the documenation section to match any bit to field conversions.

Signed-off-by: Mark Branstad <d7ca710cc6ec5dc810c866dae5369b19445fbeef@wdc.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan