[riscv-port-jdk17u:riscv-port] RFR: 8305112: RISC-V: Typo fix for RVC description

[Fei Yang]

On Thu, 30 Mar 2023 08:54:09 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

> Backport the trivial typo fix in the RVC description, mentioned in #28.

Marked as reviewed by fyang (Committer).

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PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/30#pullrequestreview-1364660484