Update header comments with correct theme name.

apostrophe-2/css/blocks.css

@@ -1,5 +1,5 @@
 /*
-Theme Name: Affinity
+Theme Name: Apostrophe 2
 Description: Used to style Gutenberg Blocks.
 */
 

apostrophe-2/css/editor-blocks.css

@@ -1,6 +1,6 @@
 
 /*
- * Theme Name: Affinity
+ * Theme Name: Apostrophe 2
  * Description: Gutenberg Block Editor Styles
  */