cryptodev: fix comments of modular operation parameters

The Doxygen comments are made after the struct field,
but were missing the Doxygen syntax /**<.

Fixes: 518a974 ("cryptodev: reorganize asymmetric structs")
Cc: stable@dpdk.org

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

lib/cryptodev/rte_crypto_asym.h

@@ -395,9 +395,9 @@ struct rte_crypto_sm2_xform {
  */
 struct rte_crypto_mod_op_param {
 	rte_crypto_uint base;
-	/** Base of modular exponentiation/multiplicative inverse */
+	/**< Base of modular exponentiation/multiplicative inverse. */
 	rte_crypto_uint result;
-	/** Result of modular exponentiation/multiplicative inverse */
+	/**< Result of modular exponentiation/multiplicative inverse. */
 };
 
 /**