Add/fix references to RxScalaDemo's new location

RxScalaDemo was moved to not longer be in rx.lang.scala,
but references to this file may exist over the wiki and internet.
Therefore this file is kept to guide users where to find it now.

Author: hermanbanken

README.md

@@ -60,7 +60,7 @@ def never: Observable[Nothing]
 
 Also, the Scala Observable is fully covariant in its type parameter, whereas the Java Observable only achieves partial covariance due to limitations of Java's type system (or if you can fix this, your suggestions are very welcome).
 
-For more examples, see [RxScalaDemo.scala](https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/rx/lang/scala/examples/RxScalaDemo.scala).
+For more examples, see [RxScalaDemo.scala](https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/examples/RxScalaDemo.scala).
 
 Scala code using Rx should only import members from `rx.lang.scala` and below.
 

examples/src/test/scala/rx/lang/scala/examples/RxScalaDemo.scala

@@ -0,0 +1,4 @@
+/**
+ * Moved to examples/src/test/scala/examples/RxScalaDemo.scala
+ * See https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/examples/RxScalaDemo.scala
+ */

src/main/scala/rx/lang/scala/Observable.scala

@@ -4813,8 +4813,8 @@ object Observable {
    * See <a href="http://go.microsoft.com/fwlink/?LinkID=205219">Rx Design Guidelines (PDF)</a> for detailed
    * information.
    *
-   * See `<a href="https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/rx/lang/scala/examples/RxScalaDemo.scala">RxScalaDemo</a>.createExampleGood`
-   * and `<a href="https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/rx/lang/scala/examples/RxScalaDemo.scala">RxScalaDemo</a>.createExampleGood2`.
+   * See `<a href="https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/examples/RxScalaDemo.scala">RxScalaDemo</a>.createExampleGood`
+   * and `<a href="https://github.com/ReactiveX/RxScala/blob/0.x/examples/src/test/scala/examples/RxScalaDemo.scala">RxScalaDemo</a>.createExampleGood2`.
    *
    * @tparam T
    *            the type of the items that this Observable emits