[examples] Fix multi-target examples

Author: salkinium

examples/generic/README.md

@@ -21,12 +21,14 @@
   <options>
     <option name="modm:build:build.path">../../../build/generic/delay</option>
     <option name="modm:io:with_printf">true</option>
+    <!-- Required for modm:samd21-mini -->
     <!-- <option name="modm:tinyusb:config">device.cdc</option> -->
   </options>
   <modules>
     <module>modm:build:scons</module>
     <module>modm:debug</module>
     <module>modm:driver:cycle_counter</module>
+    <!-- Required for modm:samd21-mini -->
     <!-- <module>modm:tinyusb</module> -->
   </modules>
 </library>