Fix typos/style in doxygen documentation
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 4586fc0..ffd06dd 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -546,7 +546,7 @@
* \param buf buffer to write to
* \param size size of the buffer
*
- * \return 0 successful, or a specific error code
+ * \return 0 if successful, or a specific error code
*/
int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
@@ -557,7 +557,7 @@
* \param buf buffer to write to
* \param size size of the buffer
*
- * \return 0 successful, or a specific error code
+ * \return 0 if successful, or a specific error code
*/
int mbedtls_pk_write_key_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
#endif /* MBEDTLS_PEM_WRITE_C */