Updates content and style, also adds a description

lib/patterns/two-images.php

@@ -8,6 +8,6 @@
 return array(
 	'title'       => __( 'Two images side by side', 'gutenberg' ),
 	'categories'  => array( 'gallery' ),
-	'description' => _x( 'An image gallery with two cropped example images.', 'Block pattern description', 'gutenberg' ),
-	'content'     => "<!-- wp:gallery {\"ids\":[null,null],\"align\":\"wide\"} -->\n<figure class=\"wp-block-gallery alignwide columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img src=\"https://s.w.org/images/core/5.5/Glacial_lakes,_Bhutan.jpg\" alt=\"\" data-id=\"\"/></figure></li><li class=\"blocks-gallery-item\"><figure><img src=\"https://s.w.org/images/core/5.5/Sediment_off_the_Yucatan_Peninsula.jpg\" alt=\"\" data-id=\"\"/></figure></li></ul></figure>\n<!-- /wp:gallery -->",
+	'description' => _x( 'An image gallery with two example images.', 'Block pattern description', 'gutenberg' ),
+	'content'     => "<!-- wp:gallery {\"ids\":[null,null],\"align\":\"wide\"} -->\n<figure class=\"wp-block-gallery alignwide columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img src=\"https://s.w.org/images/core/5.5/don-quixote-05.jpg\" alt=\"" . __( 'An old pencil drawing of Don Quixote and Sancho Panza sitting on their horses, by Wilhelm Marstrand.', 'gutenberg' ) . "\"/></figure></li><li class=\"blocks-gallery-item\"><figure><img src=\"https://s.w.org/images/core/5.5/don-quixote-01.jpg\" alt=\"" . __( 'An old pencil drawing of Don Quixote and Sancho Panza sitting on their horses, by Wilhelm Marstrand.', 'gutenberg' ) . "\"/></figure></li></ul></figure>\n<!-- /wp:gallery -->",
 );