doc: updated descriptions

include/zh_encoder.h

@@ -138,6 +138,8 @@ extern "C"
     /**
      * @brief Deinitialize encoder.
      *
+     * @param[in, out] handle Pointer to unique encoder handle.
+     *
      * @return ESP_OK if success or an error code otherwise.
      */
     esp_err_t zh_encoder_deinit(zh_encoder_handle_t *handle);