Minor fixes to parameter validation in ECDH module
diff --git a/include/mbedtls/ecdh.h b/include/mbedtls/ecdh.h
index f17446c..05b2b03 100644
--- a/include/mbedtls/ecdh.h
+++ b/include/mbedtls/ecdh.h
@@ -312,8 +312,8 @@
* \param ctx The ECDH context to set up. This must be initialized.
* \param key The EC key to use. This must be initialized.
* \param side Defines the source of the key. Possible values are:
- * - \c 1: The imported key is ours.
- * - \c 0: The imported key is that of the peer.
+ * - #MBEDTLS_ECDH_OURS: The key is ours.
+ * - #MBEDTLS_ECDH_THEIRS: The key is that of the peer.
*
* \return \c 0 on success.
* \return Another \c MBEDTLS_ERR_ECP_XXX error code on failure.
@@ -338,7 +338,7 @@
* \param olen The address at which to store the number of Bytes written.
* This must not be \c NULL.
* \param buf The destination buffer. This must be a writable buffer
- * of lsength \p blen Bytes.
+ * of length \p blen Bytes.
* \param blen The size of the destination buffer \p buf in Bytes.
* \param f_rng The RNG function to use. This must not be \c NULL.
* \param p_rng The RNG context to be passed to \p f_rng. This may be