wg-rustc-dev-guide.toml: reduce name varieties of the group

[tshepang]

Either use the repo name or the full name, but not also the third form. Also, it being capitalized made it seem like a formal name, which it's not.

cc @BoxyUwU

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
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[apiraino]

The title I see on that website is "Rust Compiler Development Guide". Perhaps did you mean to use that? rustc-dev-guide is (iiuc) the domain name so imo not very clear.

[tshepang]

I went for the shorter name for the title to avoid it being too wordy, and added the formal name on the description