Update default anisotropy value in Texture.js

[thibka]

Related issue: #32321

Description

Updates the Texture.anisotropy documentation to reference the correct default value (Texture.DEFAULT_ANISOTROPY instead of 0)

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	358.3 86.96	358.3 86.96	+0 B +0 B
WebGPU	620.54 174.18	620.54 174.18	+0 B +0 B
WebGPU Nodes	619.14 173.92	619.14 173.92	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	490.25 121.78	490.25 121.78	+0 B +0 B
WebGPU	691.41 189.78	691.41 189.78	+0 B +0 B
WebGPU Nodes	632.86 172.96	632.86 172.96	+0 B +0 B