Fix typo in brightness adjustment description

Author: InvisibleWater

colors/color.html

@@ -288,7 +288,7 @@ <h3 class="subheading" id="bright">Changing Brightness</h3>
 let color = hslToRgb(colorHSL[0], colorHSL[1], colorHSL[2]);</code></pre></div>
         <img src="images/HSLTwiceDarkFroggies.png" class="page-image">
         <img src="images/HSVTwiceDarkFroggies.png" class="page-image">
-        <p>You can also decreased the brightness by subtracting a value from it instead:</p>
+        <p>You can also decrease the brightness by subtracting a value from it instead:</p>
         <div class="code-container"><pre><code class="language-javascript">let colorHSL = rgbToHsl(data.data[i], data.data[i + 1], data.data[i + 2]);
 colorHSL[2] -= (50 / 255);