8358809: Improve link to stdin.encoding from java.lang.IO

Reviewed-by: naoto
Backport-of: d024f58e61ec27f6c13fde5dadb95c31875815d6

Author: Stuart Marks

src/java.base/share/classes/java/lang/IO.java

@@ -38,7 +38,7 @@
  * <p>
  * The {@link #readln()} and {@link #readln(String)} methods decode bytes read from
  * {@code System.in} into characters. The charset used for decoding is specified by the
- * {@link System#getProperties stdin.encoding} property. If this property is not present,
+ * {@link System##stdin.encoding stdin.encoding} property. If this property is not present,
  * or if the charset it names cannot be loaded, then UTF-8 is used instead. Decoding
  * always replaces malformed and unmappable byte sequences with the charset's default
  * replacement string.