chore(ui): add more info to table footer (#7788)

### Description

Add explanation to the table footer of how to interact with tasks.

### Testing Instructions

<img width="1118" alt="Screenshot 2024-03-20 at 1 26 04 PM"
src="https://github.com/vercel/turbo/assets/4131117/e0b9f632-61f4-4bdf-a79b-ece4c0d0f2eb">


Closes TURBO-2664

crates/turborepo-ui/src/tui/table.rs

@@ -17,7 +17,8 @@ use super::{
     Error,
 };
 
-const FOOTER_TEXT: &str = "Use arrow keys to navigate";
+const FOOTER_TEXT: &str = "Use arrow keys to navigate. Press `Enter` to interact with a task and \
+                           `Ctrl-Z` to stop interacting";
 
 /// A widget that renders a table of their tasks and their current status
 ///