Update geometry.html

Update fromBufferGeometry() documentation, so the user is aware that the resultant geometry contains duplicated vertices.

docs/api/en/core/Geometry.html

@@ -266,7 +266,8 @@
 		</p>
 
 		<h3>[method:Geometry fromBufferGeometry]( [param:BufferGeometry geometry] )</h3>
-		<p>Convert a [page:BufferGeometry] to a Geometry.</p>
+		<p>Convert a [page:BufferGeometry] to a Geometry. <br />
+		The array used to store the vertices in the bufferGeometry is a non indexed array, so the resultant geometry may contain duplicated vertices. Use [page:mergeVertices] to remove them.</p>
 
 		<h3>[method:Geometry lookAt] ( [param:Vector3 vector] )</h3>
 		<p>