Fix misspelled word in sketch comment

The codespell tool is used for automated detection of common misspellings in the files of this project.

A new release of codespell includes an expansion of its misspellings dictionary. The new version was able to catch a
previously undetected typo in a sketch comment, which is hereby corrected.

Author: per1234

examples/Advanced/ADC_Multi_Channel_Dynamic/ADC_Multi_Channel_Dynamic.ino

@@ -34,7 +34,7 @@ void queryPins() {
         }
     } while (!(c == '\n' || num_active_pins >= AN_MAX_ADC_CHANNELS));
 
-    // No (valid) input? Repeat previous measurement cylce
+    // No (valid) input? Repeat previous measurement cycle
     if (!num_active_pins) {
         num_active_pins = old_num_active_pins;
     }