Fixing syntax error in manpage
--- a/docs/tuna.8
+++ b/docs/tuna.8
@@ -60,10 +60,10 @@ CPU\-LIST affected by commands. Requires
 Operation will affect children threads.
 .TP
 \fB\-f\fR, \fB\-\-filter\fR
-Disable display of selected CPUs in \fB--gui\fR. Requires \fB-c\R.
+Disable display of selected CPUs in \fB--gui\fR. Requires \fB-c\fR.
 .TP
 \fB\-G\fR, \fB\-\-cgroup\fR
-Display the processes with the type of cgroups they are in. Requires \fB-P\R.
+Display the processes with the type of cgroups they are in. Requires \fB-P\fR.
 .TP
 \fB\-K\fR, \fB\-\-no_kthreads\fR
 Operations will not affect kernel threads.
