Release Note: Description for Toolkit.getImage() and Toolkit.createImage()

The changes made under JDK-8033530 introduced an inconsistency between the implementation for and the documentation of the following methods:

 * `java.awt.Toolkit.getImage(URL u)`
 * `java.awt.Toolkit.createimage(URL u)`

The description in the API document should read:

>This method first checks if there is a security manager installed. If so, the method calls the security managers `checkPermission()` method with the corresponding permission to ensure that the access to the image or the image creation is allowed. If the connection to the specified URL requires either URLPermission or SocketPermission, then `URLPermission` is used for security checks.