Implemented WEBPAGE_REFRESH_INTERVAL environmental variable

Author: Zozman

README.md

@@ -171,7 +171,8 @@ To enable status checking for Twitch, provide a `TWITCH_CHANNEL`, `TWITCH_CLIENT
    - For more information about registering an app on Twitch, see [the developer documentation](https://dev.twitch.tv/docs/authentication/register-app/).
 - `WEBPAGE_REFRESH_INTERVAL`
    - String
-   - If set to a positive integer, the browser will automatically refresh the webpage at the specified interval in seconds. This can help prevent issues with stale content or memory leaks during long streaming sessions, as a memory can build if the `WEBPAGE_URL` location has memory leaks. If not set or set to an invalid value, automatic refresh is disabled.
+   - If set to a positive integer, the browser will automatically refresh the webpage at the specified interval in seconds. This can help prevent issues with stale content or memory leaks during long streaming sessions, as a memory usage can build if the `WEBPAGE_URL` location has memory leaks.
+   - If not set or set to an invalid value, automatic refresh is disabled.
 - `WEBPAGE_URL`
    - String
    - Default: `https://google.com`