[PATCH v3 5/6] docs: reset: document cold reset option

[dmukhin at ford.com]

From: Denis Mukhin <dmukhin at ford.com> 

Update the reset command documentation to cover `reset -c` and explain
that the default reset type can be overridden through the relevant
Kconfig choice.

Signed-off-by: Denis Mukhin <dmukhin at ford.com>
---
Changes since v2:
- n/a

Changes since v1:
- new patch
---
 doc/usage/cmd/reset.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/usage/cmd/reset.rst b/doc/usage/cmd/reset.rst
index 79bc8b9deca5..e319d2146caa 100644
--- a/doc/usage/cmd/reset.rst
+++ b/doc/usage/cmd/reset.rst
@@ -12,6 +12,7 @@ Synopsis
 ::
 
     reset
+    reset -c
     reset -w
     reset -edl
 
@@ -21,6 +22,13 @@ Description
 Perform reset of the CPU. By default does COLD reset, which resets CPU,
 DDR and peripherals, on some boards also resets external PMIC.
 
+The default behavior may be overridden via
+CONFIG_SYSRESET_CMD_RESET_DEFAULT_{COLD,WARM,POWER,POWER_OFF}.
+
+-c
+    Do COLD reset: reset CPU and peripheral/DDR; on some boards also resets
+    external PMIC.
+
 -w
     Do WARM reset: reset CPU but keep peripheral/DDR/PMIC active.
 
-- 
2.54.0