link url fix (#2086)

Author: mcmchris

content/hardware/07.opta/opta-family/opta-analog-exp/product.md

@@ -2,7 +2,7 @@
 title: Opta Analog Expansion
 url_shop: https://store.arduino.cc/products/opta-ext-a0602
 url_guide: /tutorials/opta-analog-exp/user-manual
-primary_button_url: /tutorials/opta/user-manual#opta-analog-expansion
+primary_button_url: /tutorials/opta/user-manual#opta-analog-expansions
 primary_button_title:  User Manual
 secondary_button_url: /software/plc-ide/
 secondary_button_title: PLC IDE Guide