Remove mention of the compatibility option 'q', which is

intentionally undocumented and its only purpose is that
we do not bail out when used as a drop-in replacement of
a different implementation.

PR:		docs/184550
MFC after:	2 weeks

usr.bin/bc/bc.1

@@ -43,7 +43,7 @@
 .Nd arbitrary-precision arithmetic language and calculator
 .Sh SYNOPSIS
 .Nm bc
-.Op Fl chlqv
+.Op Fl chlv
 .Op Fl e Ar expression
 .Op Ar file ...
 .Sh DESCRIPTION

usr.bin/bc/bc.y

@@ -1023,7 +1023,7 @@ static void
 usage(void)
 {
 
-	fprintf(stderr, "usage: %s [-chlqv] [-e expression] [file ...]\n",
+	fprintf(stderr, "usage: %s [-chlv] [-e expression] [file ...]\n",
 	    __progname);
 	exit(1);
 }