Merge pull request #16635 from Mugen87/dev32

JSM: Added module and TS file for TerrainShader.

Author: mrdoob

docs/manual/en/introduction/Import-via-modules.html

@@ -288,6 +288,7 @@ <h2>Importable Examples</h2>
 						<li>SobelOperatorShader</li>
 						<li>SSAOShader</li>
 						<li>TechnicolorShader</li>
+						<li>TerrainShader</li>
 						<li>ToneMapShader</li>
 						<li>TriangleBlurShader</li>
 						<li>UnpackDepthRGBAShader</li>