Describe the RubyGems override and record the branch's shipping prerequisites

manual/52-china.md

@@ -22,7 +22,7 @@ The installer sets up Rime Ice offline, from data bundled on the ISO, so Chinese
 
 ## Developer mirrors
 
-China machines point the common package managers at mirrors inside China. Environment variables in `/etc/environment.d/90-omarchy-china.conf` cover npm, PyPI and uv, Go, rustup, Bundler and Maven; they reach everything started from the desktop after your next login (not SSH or TTY shells), and they take precedence over npm, pip, uv and Go config files, so unset the variable in a shell to opt out. `/.cargo/config.toml` (crates.io) and `/etc/gemrc` (RubyGems) are system-wide defaults that a project's own config overrides. Omarchy never replaces one of those two files if it is a regular file you created. Toolchain downloads by mise, such as Node.js or Go themselves, still come from upstream.
+China machines point the common package managers at mirrors inside China. Environment variables in `/etc/environment.d/90-omarchy-china.conf` cover npm, PyPI and uv, Go, rustup, Bundler and Maven; they reach everything started from the desktop after your next login (not SSH or TTY shells), and they take precedence over npm, pip, uv and Go config files, so unset the variable in a shell to opt out. `/.cargo/config.toml` points crates.io at the mirror unless a project's `.cargo/config.toml` says otherwise, and `/etc/gemrc` sets the RubyGems source unless your `~/.gemrc` sets another. Omarchy never replaces one of those two files if it is a regular file you created. Toolchain downloads by mise, such as Node.js or Go themselves, still come from upstream.
 
 ## China Apps