Fix typo (pallete -> palette) (#2020)

helix-term/src/commands.rs

@@ -414,7 +414,7 @@ pub fn doc(&self) -> &str {
         decrement, "Decrement",
         record_macro, "Record macro",
         replay_macro, "Replay macro",
-        command_palette, "Open command pallete",
+        command_palette, "Open command palette",
     );
 }