apps/nsh: fix switchboot command spelling error

modify swtichboot -> switchboot

Signed-off-by: yangsong8 <[email protected]>

Author: yangsong8-a1

nshlib/nsh_command.c

@@ -580,7 +580,7 @@ static const struct cmdmap_s g_cmdmap[] =
 #endif
 
 #if defined(CONFIG_BOARDCTL_SWITCH_BOOT) && !defined(CONFIG_NSH_DISABLE_SWITCHBOOT)
-  CMD_MAP("swtichboot", cmd_switchboot, 2, 2, "<image path>"),
+  CMD_MAP("switchboot", cmd_switchboot, 2, 2, "<image path>"),
 #endif
 
 #if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)