remove reference to fixed SI-8700

as requested/suggested on Gitter.

Also fiddle with the text to imply the fix in scala/scala#5487.

src/reference/02-DetailTopics/02-Configuration/06-Java-Sources.md

@@ -64,17 +64,15 @@ compile will always provide full checking, however.
 
 The Scala compiler does not identify compile-time constant variables
 (Java specification [4.12.4](http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.12.4))
-as such when parsing a Java file from source.
+in Java source code if their definition is not a literal.
 This issue has several symptoms, described in the Scala ticket [SI-5333](https://github.com/scala/bug/issues/5333):
 
-1. The selection of a constant variable is rejected when used as an argument
+1. The selection of a (non-literal) constant variable is rejected when used as an argument
 to a Java annotation (a compile-time constant expression is required).
 2. The selection of a constant variable is not replaced by its value, but compiled
 as an actual field load (the
 [Scala specification 4.1](http://www.scala-lang.org/files/archive/spec/2.11/04-basic-declarations-and-definitions.html#value-declarations-and-definitions)
 defines that constant expressions should be replaced by their values).
-3. Exhaustiveness checking does not work when pattern matching on the values of a
-Java enumeration ([SI-8700](https://github.com/scala/bug/issues/8700)).
 
 Since Scala 2.11.4, a similar issue arises when using a Java-defined annotation in
 a Scala class. The Scala compiler does not recognize `@Retention` annotations when