clean up

crates/nu-plugin-engine/src/persistent.rs

@@ -50,7 +50,7 @@ struct RunningPlugin {
     interface: PluginInterface,
     /// Garbage collector for the plugin
     gc: PluginGc,
-    /// todo: docs
+    /// RAII guard for this plugin's ctrl-c handler
     _ctrlc_guard: Option<ctrlc::Guard>,
 }
 

crates/nu-plugin/src/plugin/interface/mod.rs

@@ -501,7 +501,8 @@ impl EngineInterface {
         self.state.writer.is_stdout()
     }
 
-    /// todo: docs
+    /// Register a closure which will be called when the engine receives a Ctrl-C signal. Returns a
+    /// RAII guard that will keep the closure alive until it is dropped.
     pub fn register_ctrlc_handler(&self, handler: ctrlc::Handler) -> ctrlc::Guard {
         self.state.ctrlc_handlers.register(handler)
     }