Fixes minor typos in comments in pk.h and ctr_drbg.c
Fixes typos in PRs #475 and #437
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 458bb51..f9f9b9b 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -496,11 +496,12 @@
* \brief Load and parse a public key
*
* \param ctx key to be initialized
- * \param path filename to read the private key from
+ * \param path filename to read the public key from
*
* \note On entry, ctx must be empty, either freshly initialised
- * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
- * specific key type, check the result with mbedtls_pk_can_do().
+ * with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
+ * you need a specific key type, check the result with
+ * mbedtls_pk_can_do().
*
* \note The key is also checked for correctness.
*