[PATCH 4/9] dm: core: Add documentation for the dm command

[Simon Glass]

Add a description and examples for the dm subcommands.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 doc/usage/cmd/dm.rst | 487 +++++++++++++++++++++++++++++++++++++++++++
 doc/usage/index.rst  |   1 +
 2 files changed, 488 insertions(+)
 create mode 100644 doc/usage/cmd/dm.rst

Applied to u-boot-dm, thanks!