doc: fix typo in l2fwd-crypto guide

This patch fixes a typo in the l2fwd-crypto documentation where
the l2fwd-crypt was changed to l2fwd-crypto.

Fixes: 7cacb05 ("doc: add generic build instructions for sample apps")
Cc: stable@dpdk.org

Signed-off-by: Joel Kavanagh <joel.kavanagh@intel.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

doc/guides/sample_app_ug/l2_forward_crypto.rst

@@ -30,7 +30,7 @@ Compiling the Application
 
 To compile the sample application see :doc:`compiling`.
 
-The application is located in the ``l2fwd-crypt`` sub-directory.
+The application is located in the ``l2fwd-crypto`` sub-directory.
 
 Running the Application
 -----------------------