Update incorrect documentation for setMatrixAt (#33310)

src/objects/InstancedMesh.js

@@ -341,7 +341,7 @@ class InstancedMesh extends Mesh {
 
 	/**
 	 * Sets the given local transformation matrix to the defined instance. Make sure you set the `needsUpdate` flag of
-	 * {@link InstancedMesh#instanceMatrix} to `true` after updating all the colors.
+	 * {@link InstancedMesh#instanceMatrix} to `true` after updating all the matrices.
 	 *
 	 * @param {number} index - The instance index.
 	 * @param {Matrix4} matrix - The local transformation.