[PATCH] docs: remove tree links from the main index

[Costa Shulyupin <costa.shul@redhat.com>]

and leave only their neighbor subsystem-apis

because these links are already listed under
section "Core subsystems" of Documentation/subsystem-apis.rst:

    Core subsystems
    ---------------

    .. toctree::
       :maxdepth: 1

       core-api/index
       driver-api/index
       mm/index
       power/index
       scheduler/index
       timers/index
       locking/index

Reference:
- https://www.kernel.org/doc/html/next/subsystem-apis.html#core-subsystems

Motivation:
- make the documentation more organized
- increase consistency, observability and maintainability
- improve balance of ToC tree by reducing overly populated lists
- avoid duplicate parallel links
- escape tangling of links
- intention to fit the main index into one page

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
---
 Documentation/index.rst | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/Documentation/index.rst b/Documentation/index.rst
index 9dfdc826618c..8d8b7eab1131 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -38,10 +38,7 @@ kernel.
 .. toctree::
    :maxdepth: 1
 
-   core-api/index
-   driver-api/index
    subsystem-apis
-   Locking in the kernel <locking/index>
 
 Development tools and processes
 ===============================
-- 
2.41.0