binman: Update links for sending patches

When linking to our documentation for submitting patches, we shouldn't
point at the old wiki but instead our current documentation.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/binman/entries.rst b/tools/binman/entries.rst
index 1248270..d82f7b8 100644
--- a/tools/binman/entries.rst
+++ b/tools/binman/entries.rst
@@ -221,7 +221,7 @@
 
 .. _FIP: https://trustedfirmware-a.readthedocs.io/en/latest/design/firmware-design.html#firmware-image-package-fip
 .. _`TF-A source tree`: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
-.. _`send a patch`: https://www.denx.de/wiki/U-Boot/Patches
+.. _`send a patch`: https://docs.u-boot.org/en/latest/develop/sending_patches.html