tui: update session navigation help text to be more descriptive

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -1729,8 +1729,8 @@ function Task(props: ToolProps<typeof TaskTool>) {
             </Show>
           </box>
           <text fg={theme.text}>
-            {keybind.print("session_child_cycle")}, {keybind.print("session_child_cycle_reverse")}
-            <span style={{ fg: theme.textMuted }}> to navigate between subagent sessions</span>
+            {keybind.print("session_child_cycle")}
+            <span style={{ fg: theme.textMuted }}> view subagents</span>
           </text>
         </BlockTool>
       </Match>