PSA PAKE: improve documentation

Minor documentation improvement and fixes.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index bb01d53..4428fc0 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -1144,13 +1144,14 @@
  * \param alg           A PAKE algorithm (PSA_ALG_XXX value such that
  *                      #PSA_ALG_IS_PAKE(\p alg) is true).
  * \param cipher_suite  A cipher suite that is compatible with algorithm \p alg.
- * \param output        An output type used with algorithm \p alg.
+ * \param output_step   A value of type ::psa_pake_data_t that is valid for the
+ *                      algorithm \p alg.
  * \return              A sufficient output buffer size for the specified
  *                      output, cipher suite and algorithm. If the cipher suite,
  *                      the output type or PAKE algorithm is not recognized, or
  *                      the parameters are incompatible, return 0.
  */
-#define PSA_PAKE_OUTPUT_SIZE(alg, cipher_suite, output)
+#define PSA_PAKE_OUTPUT_SIZE(alg, cipher_suite, output_step)
 
 /** Output buffer size for psa_pake_output() for any of the supported cipher
  * suites and PAKE algorithms.