[Bug target/112650] RISC-V parameters are not documented

[sandra at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112650

--- Comment #2 from sandra at gcc dot gnu.org ---
I'm putting this on hold pending resolution of PR123245, as the consensus seems
to be that the params documentation should be moved to the internals manual.