Add examples for some more commands (#1765)

crates/nu-cli/src/commands/nth.rs

@@ -39,6 +39,19 @@ impl WholeStreamCommand for Nth {
     ) -> Result<OutputStream, ShellError> {
         args.process(registry, nth)?.run()
     }
+
+    fn examples(&self) -> &[Example] {
+        &[
+            Example {
+                description: "Get the second row",
+                example: "echo [first second third] | get 1",
+            },
+            Example {
+                description: "Get the first and third rows",
+                example: "echo [first second third] | get 0 2",
+            },
+        ]
+    }
 }
 
 fn nth(