JDK 11 RFR of JDK-8196995: java.lang.Character should not state UTF-16 encoding is used for strings

[joe darcy]

Hello,

Text in java.lang.Character states a UTF-16 character encoding is used 
for java.lang.String. While was true for many years, it is not 
necessarily true and not true in practice as of JDK 9 due to the 
improvements from JEP 254: Compact Strings.

The statement about the encoding should be corrected.

Please review the patch below which does this. (I've formatted the patch 
so that the change is text is made clear; I'll re-flow the paragraph 
before pushing.

Thanks,

-Joe

diff -r 0b1138ce244f src/java.base/share/classes/java/lang/Character.java
--- a/src/java.base/share/classes/java/lang/Character.java    Tue Feb 06 
10:17:31 2018 -0800
+++ b/src/java.base/share/classes/java/lang/Character.java    Wed Feb 07 
11:38:06 2018 -0800
@@ -75,7 +75,7 @@
   * <a id="supplementary">Characters</a> whose code points are greater
   * than U+FFFF are called <em>supplementary character</em>s.  The Java
   * platform uses the UTF-16 representation in {@code char} arrays and
- * in the {@code String} and {@code StringBuffer} classes. In
+ * may use it elsewhere. In
   * this representation, supplementary characters are represented as a pair
   * of {@code char} values, the first from the <em>high-surrogates</em>
   * range, (\uD800-\uDBFF), the second from the