fix comment

src/shellmatta_auth.c

@@ -398,7 +398,7 @@ shellmatta_retCode_t shellmatta_auth_init(shellmatta_handle_t       handle,
 }
 
 /**
- * @brief       manually logs the passed user id in
+ * @brief       logs a passed user id into the shellmatta instance
  * @param[in]   handle      shellmatta instance handle
  * @param[in]   userId      userId to login
  * @return      errorcode   #SHELLMATTA_OK