tc-drr(8): tab unquoted in a argument to a macro

<groff: tc-drr.8>:67: warning: tab character in unquoted macro argument
<groff: tc-drr.8>:69: warning: tab character in unquoted macro argument

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Originally filed at: http://bugs.debian.org/674706Signed-off-by: Andreas Henriksson <andreas@fatal.se>

man/man8/tc-drr.8

@@ -64,9 +64,9 @@ flow filter:
 
 .B for i in .. 1024;do
 .br
-.B \ttc class add dev ..  classid $handle:$(print %x $i)
+.B "\ttc class add dev .. classid $handle:$(print %x $i)"
 .br
-.B \ttc qdisc add dev .. fifo limit 16
+.B "\ttc qdisc add dev .. fifo limit 16"
 .br
 .B done