microcom: split -d (delay) option away from -t

include/usage.h

@@ -2235,9 +2235,15 @@ USE_FEATURE_BRCTL_FANCY("\n" \
        "	n	Disallow write access to your terminal"
 
 #define microcom_trivial_usage \
-	"[-s speed] tty-name"
+       "[-d DELAY] [-t TIMEOUT] [-s SPEED] [-X] TTY"
 #define microcom_full_usage \
-	""
+       "Copy bytes for stdin to TTY and from TTY to stdout" \
+       "\n\nOptions:" \
+     "\n	-d	Wait up to DELAY ms for TTY output before sending every" \
+     "\n		next byte to it" \
+     "\n	-t	Exit if both stdin and TTY are silent for TIMEOUT ms" \
+     "\n	-s	Set serial line to SPEED"
+     "\n	-X	Disable special meaning of NUL and Ctrl-X from stdin"
 
 #define mkdir_trivial_usage \
        "[OPTION] DIRECTORY..."