fix(matter): fixes SmartButton path

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: SuGlider

docs/en/matter/ep_generic_switch.rst

@@ -90,6 +90,6 @@ Example
 Generic Switch (Smart Button)
 ******************************
 
-.. literalinclude:: ../../../libraries/Matter/examples/MatterSmartButon/MatterSmartButon.ino
+.. literalinclude:: ../../../libraries/Matter/examples/MatterSmartButton/MatterSmartButton.ino
     :language: arduino