[css-anchor-position][editorial] fix example to not talk about @Try

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -316,22 +316,16 @@ in ''anchor()'' and ''anchor-size()''.
 <div class=example>
 	For example, in the following code
 	both ''.foo'' and ''.bar'' elements
-	can use the same positioning properties and fallback,
+	can use the same positioning properties,
 	just changing the anchor element they're referring to:
 
 	<pre highlight=css>
 	.anchored {
 		position: absolute;
-		position-fallback: --under-then-over;
-	}
-
-	@position-fallback --under-then-over {
-		@try {
-			// No &lt;anchor-element> specified,
-			// so it takes from 'anchor-default'.
-			top: calc(.5em + anchor(outside));
-			bottom: auto;
-		}
+		top: calc(.5em + anchor(outside));
+		/* Since no anchor name was specified,
+		   this automatically refers to the
+		   default anchor element. */
 	}
 
 	.foo.anchored {