Use 2 spaces for indentation in example HTML

Author: ewilligers

css-grid-1/Overview.bs

@@ -985,22 +985,22 @@ Grid Items</h2>
 		<pre class="lang-markup">
 		&lt;div style="display: grid">
 
-		    &lt;!-- grid item: block child -->
-		    &lt;div id="item1">block&lt;/div>
-
-		    &lt;!-- grid item: floated element; floating is ignored -->
-		    &lt;div id="item2" style="float: left;">float&lt;/div>
-
-		    &lt;!-- grid item: anonymous block box around inline content -->
-		    anonymous item 3
-
-		    &lt;!-- grid item: inline child -->
-		    &lt;span>
-		        item 4
-		        &lt;!-- grid items do not <a href="https://www.w3.org/TR/CSS2/visuren.html#anonymous-block-level">split</a> around blocks -->
-		        &lt;q style="display: block" id=not-an-item>item 4&lt;/q>
-		        item 4
-		    &lt;/span>
+		  &lt;!-- grid item: block child -->
+		  &lt;div id="item1">block&lt;/div>
+
+		  &lt;!-- grid item: floated element; floating is ignored -->
+		  &lt;div id="item2" style="float: left;">float&lt;/div>
+
+		  &lt;!-- grid item: anonymous block box around inline content -->
+		  anonymous item 3
+
+		  &lt;!-- grid item: inline child -->
+		  &lt;span>
+		    item 4
+		    &lt;!-- grid items do not <a href="https://www.w3.org/TR/CSS2/visuren.html#anonymous-block-level">split</a> around blocks -->
+		    &lt;q style="display: block" id=not-an-item>item 4&lt;/q>
+		    item 4
+		  &lt;/span>
 		&lt;/div>
 		</pre>