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Update Logging.md

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docs/Logging.md
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@ -100,7 +100,7 @@ void extraData(String &r){
}
```
To embed this custom HTML text in the Web Log, call `homeSpan.setWebLogCallback(extraWebData)` in your sketch.
To embed this custom HTML text in the Web Log, call `homeSpan.setWebLogCallback(extraData)` in your sketch.
Note that *r* is being passed as a reference and already includes all the HTML text the Web Log has produced to set up the page and create the initial table. You should therefore *extend* this String using `+=`. Do not simple assign this variable to a new String with `=` or you will overwrite all the HTML already produced!