Revert "[nrf fromlist] doc: zms: add documentation for ZMS"

This reverts commit 03ff227.

Signed-off-by: Riadh Ghaddab <[email protected]>
(cherry picked from commit 9d02e17)

Author: rghaddab

doc/services/storage/index.rst

@@ -7,7 +7,6 @@ Storage
    :maxdepth: 1
 
    nvs/nvs.rst
-   zms/zms.rst
    disk/access.rst
    flash_map/flash_map.rst
    fcb/fcb.rst