ref-manual: organize all recipes-* directories under subdirectory

diff --git a/documentation/ref-manual/structure.rst b/documentation/ref-manual/structure.rst
index ff84b250b..fae0368b9 100644
--- a/documentation/ref-manual/structure.rst
+++ b/documentation/ref-manual/structure.rst
@@ -881,10 +881,17 @@  build process. It is enabled via the ``addpylib`` directive in
 ``meta/conf/local.conf``. For more information, see
 :ref:`bitbake-user-manual/bitbake-user-manual-metadata:extending python library code`.

+.. _structure-meta-recipes:
+
+``meta/recipes-*/``
+---------------------
+
+All of the "recipes-*" subdirectories define recipes broken into related sub-categories.
+
 .. _structure-meta-recipes-bsp:

 ``meta/recipes-bsp/``
----------------------
+~~~~~~~~~~~~~~~~~~~~~

 This directory contains anything linking to specific hardware or
 hardware configuration information such as "u-boot" and "grub".
@@ -892,7 +899,7 @@  hardware configuration information such as "u-boot" and "grub".
 .. _structure-meta-recipes-connectivity:

 ``meta/recipes-connectivity/``
-------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains libraries and applications related to
 communication with other devices.
@@ -900,7 +907,7 @@  communication with other devices.
 .. _structure-meta-recipes-core:

 ``meta/recipes-core/``
-----------------------
+~~~~~~~~~~~~~~~~~~~~~~

 This directory contains what is needed to build a basic working Linux
 image including commonly used dependencies.
@@ -908,7 +915,7 @@  image including commonly used dependencies.
 .. _structure-meta-recipes-devtools:

 ``meta/recipes-devtools/``
---------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains tools that are primarily used by the build
 system. The tools, however, can also be used on targets.
@@ -916,7 +923,7 @@  system. The tools, however, can also be used on targets.
 .. _structure-meta-recipes-extended:

 ``meta/recipes-extended/``
---------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains non-essential applications that add features
 compared to the alternatives in core. You might need this directory for
@@ -925,7 +932,7 @@  full tool functionality.
 .. _structure-meta-recipes-gnome:

 ``meta/recipes-gnome/``
------------------------
+~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains all things related to the GTK+ application
 framework.
@@ -933,7 +940,7 @@  framework.
 .. _structure-meta-recipes-graphics:

 ``meta/recipes-graphics/``
---------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains X and other graphically related system
 libraries.
@@ -941,7 +948,7 @@  libraries.
 .. _structure-meta-recipes-kernel:

 ``meta/recipes-kernel/``
-------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains the kernel and generic applications and
 libraries that have strong kernel dependencies.
@@ -949,7 +956,7 @@  libraries that have strong kernel dependencies.
 .. _structure-meta-recipes-multimedia:

 ``meta/recipes-multimedia/``
-----------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains codecs and support utilities for audio, images
 and video.
@@ -957,7 +964,7 @@  and video.
 .. _structure-meta-recipes-rt:

 ``meta/recipes-rt/``
---------------------
+~~~~~~~~~~~~~~~~~~~~

 This directory contains package and image recipes for using and testing
 the ``PREEMPT_RT`` kernel.
@@ -965,7 +972,7 @@  the ``PREEMPT_RT`` kernel.
 .. _structure-meta-recipes-sato:

 ``meta/recipes-sato/``
-----------------------
+~~~~~~~~~~~~~~~~~~~~~~

 This directory contains the Sato demo/reference UI/UX and its associated
 applications and configuration data.
@@ -973,7 +980,7 @@  applications and configuration data.
 .. _structure-meta-recipes-support:

 ``meta/recipes-support/``
--------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~

 This directory contains recipes used by other recipes, but that are not
 directly included in images (i.e. dependencies of other recipes).