update doc

pkg/cmd/extension/command.go

@@ -418,28 +418,19 @@ func NewCmdExtension(f *cmdutil.Factory) *cobra.Command {
 				Short: "Enter a UI for browsing, adding, and removing extensions",
 				Long: heredoc.Doc(`
 					This command will take over your terminal and run a fully interactive
-					interface for browsing, adding, and removing gh extensions.
+					interface for browsing, adding, and removing gh extensions. A terminal
+					width greater than 100 columns is recommended.
 
-					The extension list is navigated with the arrow keys or with j/k.
-					Space and control+space (or control + j/k) page the list up and down.
-					Extension readmes can be scrolled with page up/page down keys
-					(fn + arrow up/down on a mac keyboard).
-
-					For highlighted extensions, you can press:
-
-					- w to open the extension in your web browser
-					- i to install the extension
-					- r to remove the extension
-
-					Press / to focus the filter input. Press enter to scroll the results.
-					Press Escape to clear the filter and return to the full list.
+					To learn how to control this interface, press ? after running to see
+					the help text.
 
 					Press q to quit.
 
-					The output of this command may be difficult to navigate for screen reader
-					users, users operating at high zoom and other users of assistive technology. It
-					is also not advised for automation scripts. We advise those users to use the
-					alternative command:
+					Running this command with --single-column should make this command
+					more intelligible for users who rely on assistive technology like screen
+					readers or high zoom.
+
+					For a more traditional way to discover extensions, see:
 
 						gh ext search