Update peek.adoc

CamelCase

Author: SimonePDA

Language/Functions/Communication/Serial/peek.adoc

@@ -59,7 +59,7 @@ The first byte of incoming serial data available (or -1 if no data is available)
 * #LANGUAGE# link:../print[print()] +
 * #LANGUAGE# link:../println[println()] +
 * #LANGUAGE# link:../write[write()] +
-* #LANGUAGE# link:../serialEvent[SerialEvent()] +
+* #LANGUAGE# link:../serialevent[SerialEvent()] +
 * #LANGUAGE# link:../../stream/streampeek[Stream.peek()]
 
 --