Doxygen: fix missing markup indicator that was causing broken links
diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index b2f3eb2..6f74ba7 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -1139,7 +1139,7 @@
*
* \param handle Handle to the key to use for the operation.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
- * such that #PSA_ALG_IS_MAC(alg) is true).
+ * such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer where the MAC value is to be written.
@@ -1179,7 +1179,7 @@
*
* \param handle Handle to the key to use for the operation.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
- * such that #PSA_ALG_IS_MAC(alg) is true).
+ * such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer containing the expected MAC value.
@@ -1289,7 +1289,7 @@
* It must remain valid until the operation
* terminates.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
- * such that #PSA_ALG_IS_MAC(alg) is true).
+ * such that #PSA_ALG_IS_MAC(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.