tc: man: change man page and comment to confirm to code's behavior.

Since the get_rate() code incorrectly interpreted bare number, the
behavior is not the same as man page and comment described.

We need to change the man page and comment for compatible with the
existing usage by scripts.
diff --git a/man/man8/tc.8 b/man/man8/tc.8
index 346c545..95571a3 100644
--- a/man/man8/tc.8
+++ b/man/man8/tc.8
@@ -259,6 +259,9 @@
 .P
 Bandwidths or rates can be specified in:
 .TP
+bps
+Bytes per second
+.TP
 kbps
 Kilobytes per second
 .TP
@@ -271,8 +274,8 @@
 mbit
 Megabits per second
 .TP
-bps or a bare number
-Bytes per second
+bit or a bare number
+Bits per second
 .P
 Amounts of data can be specified in:
 .TP
diff --git a/tc/tc_util.c b/tc/tc_util.c
index 926ed08..ccf8fa4 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -153,7 +153,7 @@
 		return -1;
 
 	if (*p == '\0') {
-		*rate = bps / 8.;	/* assume bytes/sec */
+		*rate = bps / 8.;	/* assume bits/sec */
 		return 0;
 	}