[PATCH v3 04/11] binman: doc: Add documentation for fdt_add_pubkey bintool

[Simon Glass]

From: Lukas Funke <lukas.funke at weidmueller.com>

Add documentation for btool which calls 'fdt_add_pubkey'

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
Reviewed-by: Simon Glass <sjg at chromium.org>

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Changes in v3:
- Fix rst headline length

 tools/binman/bintools.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

Applied to u-boot-dm, thanks!