AI 147169: am: CL 147167 am: CL 147162 Emphasize in the javadoc that the "pkg" parame...

  InstrumentationTestCase and its descendants should be the
  package manager package name (not the java package name, and
  not the test package) of the package holding the Activity
  under test.
  Added similar notations to the ApiDemos call sites.
  JAVADOC ONLY - should be safe change for cupcake sdk.
  Original author: stadler
  Merged from: //branches/cupcake/...
  Original author: android-build

Automated import of CL 147169