fix broken link in VertexTangentsHelper docs (#21952)

* fix broken link in VertexTangentsHelper docs

* fix broken link in VertexTangentsHelper docs (zh)

docs/examples/en/helpers/VertexTangentsHelper.html

@@ -14,7 +14,7 @@
 		<p class="desc">
 			Renders arrows to visualize an object's vertex tangent vectors.
 			Requires that tangents have been specified in a [page:BufferAttribute custom attribute] or
-			have been calculated using [page:BufferGeometryUtils.computeTangents computeTangents].<br /><br />
+			have been calculated using [page:BufferGeometry.computeTangents computeTangents].<br /><br />
 
 			This helper supports [page:BufferGeometry] only.
 		</p>

docs/examples/zh/helpers/VertexTangentsHelper.html

@@ -14,7 +14,7 @@
 		<p class="desc">
 			Renders arrows to visualize an object's vertex tangent vectors.
 			Requires that tangents have been specified in a [page:BufferAttribute custom attribute] or
-			have been calculated using [page:BufferGeometryUtils.computeTangents computeTangents].<br /><br />
+			have been calculated using [page:BufferGeometry.computeTangents computeTangents].<br /><br />
 
 			This helper supports [page:BufferGeometry] only.
 		</p>