10229 Some man pages have incorrect cross-references

@@ -46,11 +46,11 @@
 .Fa which .
 .Pp
 The signal constants, representing valid values for
 .Fa which ,
 can be found in
-.Xr signal.h 3HEAD.
+.Xr signal.h 3HEAD .
 The signal
 .Dv SIGKILL
 may not be stopped.
 .Pp
 Note, only active processes may have their signal tracing flags updated.