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

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.

Author: tshepang

teams/wg-rustc-dev-guide.toml

@@ -29,8 +29,8 @@ alumni = [
 orgs = ["rust-lang"]
 
 [website]
-name = "Rustc Dev Guide working area"
-description = "Making the compiler easier to learn by maintaining and improving the Rustc Dev Guide"
+name = "rustc-dev-guide working area"
+description = "Making the compiler easier to learn by maintaining and improving the Rust Compiler Development Guide"
 repo = "https://forge.rust-lang.org/compiler/working-areas.html"
 zulip-stream = "t-compiler/rustc-dev-guide"