Fix \p misuses in documentation

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/include/mbedtls/ecdsa.h b/include/mbedtls/ecdsa.h
index cbb6d32..b7029d7 100644
--- a/include/mbedtls/ecdsa.h
+++ b/include/mbedtls/ecdsa.h
@@ -454,7 +454,7 @@
  *                  and have a group and private key bound to it, for example
  *                  via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
  * \param hash      The message hash to be signed. This must be a readable
- *                  buffer of length \p blen Bytes.
+ *                  buffer of length \p hlen Bytes.
  * \param hlen      The length of the hash \p hash in Bytes.
  * \param sig       The buffer to which to write the signature. This must be a
  *                  writable buffer of length at least twice as large as the
diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 466611f..d436635 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -509,7 +509,7 @@
  * \param san_buf  The buffer holding the raw data item of the subject
  *                 alternative name.
  * \param san      The target structure to populate with the parsed presentation
- *                 of the subject alternative name encoded in \p san_raw.
+ *                 of the subject alternative name encoded in \p san_buf.
  *
  * \note           Only "dnsName" and "otherName" of type hardware_module_name
  *                 as defined in RFC 4180 is supported.
@@ -517,7 +517,7 @@
  * \note           This function should be called on a single raw data of
  *                 subject alternative name. For example, after successful
  *                 certificate parsing, one must iterate on every item in the
- *                 \p crt->subject_alt_names sequence, and pass it to
+ *                 \c crt->subject_alt_names sequence, and pass it to
  *                 this function.
  *
  * \warning        The target structure contains pointers to the raw data of the