Update documentation for classes split

* Make reference to meta/classes* instead of just meta/classes
* Update each reference to the path where the class has moved
* Add a brief explanation to the classes reference explaining the split
* Add a note to INHERIT, INHERIT_DISTRO, IMAGE_CLASSES and USER_CLASSES
  variable glossary entries mentioning where the specified classes must
  be located. I contemplated adding the same note to PACKAGE_CLASSES
  but decided against it, as it has a very specific usage and such a
  note might distract from the narrative of that entry.
* Also trim the IMAGE_CLASSES entry which was quite outdated.
* INHERIT += no longer works with testimage so drop the note about that

(From yocto-docs rev: e76bed00b452d3049f6c22afbfb980b557a141bd)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/ref-manual/faq.rst b/documentation/ref-manual/faq.rst
index af49d57715..84affddd1e 100644
--- a/documentation/ref-manual/faq.rst
+++ b/documentation/ref-manual/faq.rst
@@ -109,7 +109,7 @@ I prevent this?
 but make sure the package is manually marked as machine-specific for the
 case that needs it. The code that handles
 :term:`SRC_URI_OVERRIDES_PACKAGE_ARCH` is in the
-``meta/classes/base.bbclass`` file.
+``meta/classes-global/base.bbclass`` file.
 
 **Q:** I'm behind a firewall and need to use a proxy server. How do I do
 that?