docs(singlestat) updates threshold explanation

The implementation of thresholds changed after fixing #3248. Docs
updated to reflect and explain the change.

docs/sources/reference/singlestat.md

@@ -31,7 +31,7 @@ The coloring options of the Singlestat Panel config allow you to dynamically cha
 
 1. `Background`: This checkbox applies the configured thresholds and colors to the entirety of the Singlestat Panel background.
 2. `Value`: This checkbox applies the configured thresholds and colors to the summary stat.
-3. `Thresholds`: Change the background and value colors dynamically within the panel, depending on the Singlestat value. The threshold field accepts **3 comma-separated** values, corresponding to the three colors directly to the right.
+3. `Thresholds`: Change the background and value colors dynamically within the panel, depending on the Singlestat value. The threshold field accepts **2 comma-separated** values which represent 3 ranges that correspond to the three colors directly to the right. For example: if the thresholds are 70, 90 then the first color represents < 70, the second color represents between 70 and 90 and the third color represents > 90.
 4. `Colors`: Select a color and opacity
 5. `Invert order`: This link toggles the threshold color order.</br>For example: Green, Orange, Red (<img class="no-shadow" src="/img/v1/gyr.png">) will become Red, Orange, Green (<img class="no-shadow" src="/img/v1/ryg.png">).