docs: remove the two remaining em dashes from Cargo.toml comments

Cargo.toml

@@ -22,7 +22,7 @@ name = "alktty"
 default = []
 # `local` is inherently non-wasm (portable-pty + tokio::process need a real
 # OS). The default crate (no features) targets `wasm32-unknown-unknown`;
-# enabling `local` on wasm is a build error by design — use a real OS for
+# enabling `local` on wasm is a build error by design: use a real OS for
 # the local-process backend. The protocol crate (wire, negotiation,
 # control, backend trait, adapter, session, channels) stays wasm-clean so
 # downstream TS/Python adapters can compile it in a sandbox.
@@ -31,8 +31,8 @@ local = ["dep:portable-pty", "dep:tokio-util", "tokio/process", "tokio/rt-multi-
 [dependencies]
 alkcall = "0.10.1"
 # Minimal, wasm-clean tokio features. `local` adds `process` +
-# `rt-multi-thread` (non-wasm). Do NOT use `features = ["full"]` — it
-# pulls in `signal`/`fs`/`net` which break `wasm32-unknown-unknown`.
+# `rt-multi-thread` (non-wasm). Do NOT use `features = ["full"]` (it
+# pulls in `signal`/`fs`/`net` which break `wasm32-unknown-unknown`).
 tokio = { version = "1", default-features = false, features = ["rt", "sync", "io-util", "macros"] }
 bytes = "1"
 futures = "0.3"