chore: Add chat.editMode to tips (#1900)

Author: evanliu048

crates/chat-cli/src/cli/chat/mod.rs

@@ -276,6 +276,7 @@ const HELP_TEXT: &str = color_print::cstr! {"
 <em>Ctrl(^) + j</em>           <black!>Insert new-line to provide multi-line prompt. Alternatively, [Alt(⌥) + Enter(⏎)]</black!>
 <em>Ctrl(^) + s</em>           <black!>Fuzzy search commands and context files. Use Tab to select multiple items.</black!>
                       <black!>Change the keybind to ctrl+x with: q settings chat.skimCommandKey x (where x is any key)</black!>
+<em>chat.editMode</em>         <black!>Set editing mode (vim or emacs) using: q settings chat.editMode vi/emacs</black!>
 
 "};