docs: blockdev: convert to ReST

Rename the blockdev documentation files to ReST, add an
index for them and adjust in order to produce a nice html
output via the Sphinx build system.

The drbd sub-directory contains some graphs and data flows.
Add those too to the documentation.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 1ffc64770643..e06b99d54816 100644
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -12,7 +12,7 @@ config ZRAM
           It has several use cases, for example: /tmp storage, use as swap
           disks and maybe many more.
 
-          See Documentation/blockdev/zram.txt for more information.
+          See Documentation/blockdev/zram.rst for more information.
 
 config ZRAM_WRITEBACK
        bool "Write back incompressible or idle page to backing device"
@@ -26,7 +26,7 @@ config ZRAM_WRITEBACK
          With /sys/block/zramX/{idle,writeback}, application could ask
          idle page's writeback to the backing device to save in memory.
 
-         See Documentation/blockdev/zram.txt for more information.
+         See Documentation/blockdev/zram.rst for more information.
 
 config ZRAM_MEMORY_TRACKING
         bool "Track zRam block status"
@@ -36,4 +36,4 @@ config ZRAM_MEMORY_TRACKING
           of zRAM. Admin could see the information via
           /sys/kernel/debug/zram/zramX/block_state.
 
-          See Documentation/blockdev/zram.txt for more information.
+          See Documentation/blockdev/zram.rst for more information.