Clean up comments in runtimes (#13870)

crates/repl/src/outputs.rs

@@ -365,13 +365,13 @@ impl ExecutionView {
 
                         // Set next input adds text to the next cell. Not required to support.
                         // However, this could be implemented by adding text to the buffer.
-                        // runtimelib::Payload::SetNextInput { text, replace } => todo!(),
+                        // runtimelib::Payload::SetNextInput { text, replace } => {},
 
                         // Not likely to be used in the context of Zed, where someone could just open the buffer themselves
-                        // runtimelib::Payload::EditMagic { filename, line_number } => todo!(),
+                        // runtimelib::Payload::EditMagic { filename, line_number } => {},
 
                         // Ask the user if they want to exit the kernel. Not required to support.
-                        // runtimelib::Payload::AskExit { keepkernel } => todo!(),
+                        // runtimelib::Payload::AskExit { keepkernel } => {},
                         _ => {}
                     }
                 }

crates/repl/src/session.rs

@@ -305,7 +305,6 @@ impl Session {
 
     fn shutdown(&mut self, cx: &mut ViewContext<Self>) {
         let kernel = std::mem::replace(&mut self.kernel, Kernel::ShuttingDown);
-        // todo!(): emit event for the runtime panel to remove this session once in shutdown state
 
         match kernel {
             Kernel::RunningKernel(mut kernel) => {