plateau: [dev branch] missing image in 4.11.1.5.1 橋梁モデル（LOD4）の概要

[ReesePlews]

for some reason an image in 4.11.1.5.1 is missing.

the image in question (source/001-v5 [ the current working files are v5]) is
image::images/250.webp.png[]

from:
sources\001-v5\sections\section-04\section-11.adoc

should look like this:

we are still checking if other images are missing or not, but it is difficult to check without continual scrolling, etc in the interface.

[ReesePlews]

this image is still missing in the Dec 31, 2024 link; i am not sure if the contents of the link (doc1) were updated or not; this is only a check.