Polishing to the auto-generated prototype lists

[eopXD]

This PR fixes the appendix of the intrinsics specification.

• Prevent the Appendices from appearing in the TOC as Chapters but rather as Appendix A, Appendix B, etc.
• Clang-format the prototypes.
• Align prototype parameter names to mnemonics of https://github.com/riscv/riscv-v-spec/blob/master/vmem-format.adoc, https://github.com/riscv/riscv-v-spec/blob/master/valu-format.adoc, and the vector specification.

[eopXD]

A gentle ping on reviewal @kito-cheng @rofirrim, thank you.