Docs: fix setMorphAt() description (#27946)

docs/api/en/objects/InstancedMesh.html

@@ -189,7 +189,7 @@
 			range [0, count].
 		</p>
 		<p>
-			[page:Matrix4 matrix]: A mesh with [page:Mesh.morphTargetInfluences .morphTargetInfluences] property containing the morph target weights
+			[page:Mesh mesh]: A mesh with [page:Mesh.morphTargetInfluences .morphTargetInfluences] property containing the morph target weights
 			of a single instance.
 		</p>
 		<p>