doc: Update documentation URL

Update to use the new docs.u-boot.org URL for documentation.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/pyproject.toml b/tools/dtoc/pyproject.toml
index 77fe4da..1c5a2fb 100644
--- a/tools/dtoc/pyproject.toml
+++ b/tools/dtoc/pyproject.toml
@@ -19,7 +19,7 @@
 ]
 
 [project.urls]
-"Homepage" = "https://u-boot.readthedocs.io/en/latest/develop/driver-model/of-plat.html"
+"Homepage" = "https://docs.u-boot.org/en/latest/develop/driver-model/of-plat.html"
 "Bug Tracker" = "https://source.denx.de/groups/u-boot/-/issues"
 
 [project.scripts]