Merge pull request #2168 from arduino/mcmchris/opta/user-manual-fw-update

[PC-1954] FW Update section on Expansion Tutorials

Author: mcmchris

content/hardware/07.opta/opta-family/opta/tutorials/01.user-manual/content.md

@@ -1739,7 +1739,7 @@ Install all the **library dependencies** suggested by clicking the **Install All
 
 Once installed, you will have access to a variety of sketch examples showcasing the expansions capabilities and how to use them.
 
-#### Update Expansion Firmware
+### Update Expansion Firmware
 
 With the library properly installed, we will update the expansion firmware to ensure proper functioning and seamless detection.