libcore: fix typo in comment

Wrong javadoc broke git_dalvik-dev build

Change-Id: I7697b4cddf44c5ddef7d7d4c0e1d3115b43887f0
diff --git a/luni/src/main/java/java/nio/charset/ModifiedUtf8.java b/luni/src/main/java/java/nio/charset/ModifiedUtf8.java
index 3910eac..51638ee 100644
--- a/luni/src/main/java/java/nio/charset/ModifiedUtf8.java
+++ b/luni/src/main/java/java/nio/charset/ModifiedUtf8.java
@@ -110,7 +110,7 @@
      * {@code out},
      *
      * <p>A maximum of {@code length} chars are written to the output starting at offset 0.
-     * {@out} is assumed to have enough space for the output (a standard
+     * {@code out} is assumed to have enough space for the output (a standard
      * {@code ArrayIndexOutOfBoundsException} is thrown otherwise).
      *
      * <p>If a ‘0’ byte is encountered, it is converted to U+0000.