fix: the --allow-origin help was a three-line comment run

CI's `check-comment-runs.py` runs with no flags and the local gate in my brief
runs it with `--check-evidence`, which reports the evidence audit and not the
run cap — so a three-line clap doc comment passed locally and failed in CI.
Run both spellings.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FC2jVn8Au7E9JPkw6bwXXH

crates/improvise-ws-server/src/main.rs

@@ -32,9 +32,8 @@ struct Args {
     #[arg(long, default_value = "127.0.0.1")]
     bind: String,
 
-    /// An origin a browser page may open a socket from, such as
-    /// `https://example.github.io`. Repeatable. Loopback pages are always
-    /// allowed; every other page is refused unless it is named here.
+    /// An origin a browser page may open a socket from, e.g.
+    /// `https://example.github.io`. Repeatable; loopback is always allowed.
     #[arg(long = "allow-origin", value_name = "ORIGIN")]
     allow_origin: Vec<String>,
 }