Update hard_copy.md

Author: bboyho

docs/hard_copy.md

@@ -4,6 +4,6 @@ icon: material/book-open-variant
 
 Need to download or print our hookup guide?
 
-* [Print :fontawesome-solid-print:](../single_page) (Single-Page View)
+* [Print :fontawesome-solid-print:](../single_page.md) (Single-Page View)
     * To save as a `*.pdf` file, select the **Printer** or **Destination** labeled ++"Save as PDF"++. *(Instructions will vary based on the browser)*
 * [Download :fontawesome-regular-file-pdf:](../hookup_guide.pdf) *(Beta - demonstration only)*