Fix text in S.yaml

[dhower-qc]

Fixes #432

[kbroch-rivosinc]

I think U-ext has the same issue: https://github.com/riscv-software-src/riscv-unified-db/blob/main/arch/ext/U.yaml#L23

[dlweaver]

This resolution looks good!

[ThinkOpenly]

I think this needs to be reopened in order to get U-mode fixed and get everything merged.

[dlweaver]

Sorry, Paul -- (as a GitHub newbie,) I thought a new Issue needed to be opened, since U.yaml was a different file.
Happy to leave this open if it can apply to U.yaml as well.

[ThinkOpenly]

Sorry, Paul

No problem! (Just a bit surprising. ;-)

I thought a new Issue needed to be opened, since U.yaml was a different file. Happy to leave this open if it can apply to U.yaml as well.

It can be used for both. Indeed, this is the vehicle for adding the changes, so the proposed change from Derek (and presumably an additional change from Derek for U.yaml) will appear here, where they can be reviewed, approved, and merged. That final act, merging, will automatically close this pull request.