Fix typo in CSS color-scheme doc (mdn#3293)

files/en-us/web/css/color-scheme/index.html

@@ -17,7 +17,7 @@
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 <div>{{CSSRef}}</div>
 
-<p><span class="seoSummary">The <strong><code>color-scheme</code></strong> CSS property allows an element to indicate which color schemes is can comfortably be rendered in.</span></p>
+<p><span class="seoSummary">The <strong><code>color-scheme</code></strong> CSS property allows an element to indicate which color schemes it can comfortably be rendered in.</span></p>
 <p>Common choices for operating system color schemes are "light" and "dark", or "day mode" and "night mode". When a user selects one of these color schemes, the operating system makes adjustments to the user interface. This includes form controls, scrollbars, and the used values of CSS system colors.</p>
 
 <h2 id="Syntax">Syntax</h2>