GSOC 26: document multi-material and texture map support

[Nixxx19]

what

phase 7 docs. updates the jsdoc for loadModel(), model(), and buildGeometry() so the reference explains multi-material and texture-map support, which the docs didn't mention before.

• loadModel(): expands the mtl note to say multi-material models are drawn per part, lists the texture maps a material can use (map_Kd, map_Ks, map_Ka, map_Ns, map_Bump), and documents the graceful fallback when a texture fails to load
• model(): notes that the call is identical whether a model has one material or many, so a blender/sketchfab model shows up looking the way it was made
• buildGeometry(): notes that switching texture/material mid-callback splits the result into parts, matching how a loaded multi-material model behaves, while a plain fill() change does not split

notes

• prose only, no new runnable examples (a runnable multi-material loadModel example needs a hosted multi-material model asset, which is a separate follow-up)
• describes the full texture-map set, so this reads best merged after GSOC 26: specular, ambient, and shininess texture maps #9066 and GSOC 26: normal (bump) map support #9067 land

part of the gsoc multi-material .mtl work, follows #8879, #8955, #9063, #9066, and #9067.

[p5-bot]

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