Fix the ignore example (#3644)

crates/nu-command/src/commands/ignore.rs

@@ -28,8 +28,8 @@ impl WholeStreamCommand for Ignore {
 
     fn examples(&self) -> Vec<Example> {
         vec![Example {
-            description: "echo done | ignore",
-            example: r#"echo "There are seven words in this sentence" | size"#,
+            description: "Ignore the output of an echo command",
+            example: r#"echo done | ignore"#,
             result: None,
         }]
     }