[PATCH] common: Kconfig: BOOTM_FITIMAGE_SIGNATURE: fix help text

["Ulrich Ölmann" <u.oelmann@pengutronix.de>]

U-Boot rearranged its documentation in commit [1] and provides it rendered as
HTML today, so adjust the reference accordingly. While at it be a little bit
more precise regarding the usage of the public key.

[1] ad29e08b79fd ("doc: Bring in FIT signature files")

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
---
 common/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index 708caa6040a9..b1480431d7c5 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -693,9 +693,9 @@ config BOOTM_FITIMAGE_SIGNATURE
 	help
 	  Support verifying signed FIT images. This requires FIT images
 	  as described in:
-	  http://git.denx.de/?p=u-boot.git;a=blob;f=doc/uImage.FIT/signature.txt
+	  https://docs.u-boot.org/en/stable/usage/fit/signature.html
 	  Additionally the barebox device tree needs a /signature node with the
-	  public key with which the image has been signed.
+	  public key needed to approve the image's signature.
 
 config BOOTM_FITIMAGE_PUBKEY_ENV
 	bool "Specify path to public key in environment"
-- 
2.39.5