Fix error about internal characters encoding in Java

Slides/Class1.md

@@ -480,7 +480,7 @@ Contains real bits of Java.
 
 \begin{description}
 \item[\texttt{char}] \hfill \\
-	16 bits, UTF-8, written between simple quotes
+	16 bits, UTF-16, written between simple quotes
 \end{description}
 
 **Examples**