update link to discuss asciidoc questions, remove ruby version note a…

[kbroch-rivosinc]

…s it doesn't apply anymore

I just removed the ruby version as it's a moving target:

~/rvi/riscv/docs-dev-guide on dev/kbroch/zulip-ruby-ver:main ⇡1 ?5                                                                                                                                                         Ruby 3.1.6 at 01:45:35 PM
❯ docker run --rm -v /Users/kbroch/rvi/riscv/docs-dev-guide:/build -w /build riscvintl/riscv-docs-base-container-image:latest /bin/sh -c "ruby --version"

[kersten1]

It is a moving target but if you are building locally, you need that version. HOWEVER, that version should be with the local build info so yes, lets kill it here.