Fixed parameter name in docs (#8764)

meshphongmaterial normalMapScale -> normalScale

docs/api/materials/MeshPhongMaterial.html

@@ -38,7 +38,7 @@
 		bumpMap — Set bump map. Default is null.<br />
 		bumpMapScale — Set bump map scale. Default is 1.<br />
 		normalMap — Set normal map. Default is null.<br />
-		normalMapScale — Set normal map scale. Default is (1, 1).<br />
+		normalScale — Set normal map scale. Default is (1, 1).<br />
 		displacementMap — Set displacement map. Default is null.<br />
 		displacementScale — Set displacement scale. Default is 1.<br />
 		displacementBias — Set displacement offset. Default is 0.<br />