doc: fix pipeline example path in user guide

Updated the pipeline example path in the Sample Application User Guide.

Fixes: 29485dd ("doc: add pipeline example user guide")
Cc: stable@dpdk.org

Signed-off-by: Harshad Narayane <harshad.suresh.narayane@intel.com>
Signed-off-by: Kamalakannan R <kamalakannan.r@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

doc/guides/sample_app_ug/pipeline.rst

@@ -58,7 +58,7 @@ The following is an example command to run the application configured for the VX
 
 .. code-block:: console
 
-    $ ./<build_dir>/examples/dpdk-pipeline -c 0x3 -- -s examples/vxlan.cli
+    $ ./<build_dir>/examples/dpdk-pipeline -c 0x3 -- -s examples/pipeline/examples/vxlan.cli
 
 The application should start successfully and display as follows: