remove useless pxref to SMP subsection

doc/openocd.texi

@@ -1677,7 +1677,7 @@ Again using the at91sam7 as an example, this can look like:
 $_TARGETNAME configure -work-area-phys 0x00200000 \
              -work-area-size 0x4000 -work-area-backup 0
 @end example
-@pxref{Define CPU targets working in SMP}
+
 @anchor{Define CPU targets working in SMP}
 @subsection Define CPU targets working in SMP
 @cindex SMP