ref/dev-manual: Update multiconfig documentation

Multiconfigs now work from layers. Update the documentation to match this change.
Also fix a incorrect reference to different distros working within the same TMPDIR,
that is incorrect.

[YOCTO #13566]

(From yocto-docs rev: cb35f75bfc98c9098f9af64b9dd040b25779da36)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index e31f0ed886..375333e7f0 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -718,10 +718,11 @@ system and gives an overview of their function and contents.
 
          BBMULTICONFIG = "configA configB configC"
 
-      Each configuration file you
-      use must reside in the :term:`Build Directory`
-      ``conf/multiconfig`` directory (e.g.
-      ``build_directory/conf/multiconfig/configA.conf``).
+      Each configuration file you use must reside in a ``multiconfig``
+      subdirectory of a configuration directory within a layer, or
+      within the :term:`Build Directory` (e.g.
+      ``build_directory/conf/multiconfig/configA.conf`` or
+      ``mylayer/conf/multiconfig/configB.conf``).
 
       For information on how to use :term:`BBMULTICONFIG` in an environment
       that supports building targets with multiple configurations, see the