time.1: Document the -q/--quiet option

Reported-by: Johannes Altmanninger <aclopte@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man1/time.1

@@ -253,6 +253,12 @@ but overwrite the specified file.
 .TP
 .B "\-v, \-\-verbose"
 Give very verbose output about all the program knows about.
+.TP
+.B "\-q, \-\-quiet"
+Don't report abnormal program termination (where
+.I command
+is terminated by a signal) or nonzero exit status.
+.\"
 .SS GNU standard options
 .TP
 .B "\-\-help"