Fix typo (#9144)

docs/api/core/Geometry.html

@@ -252,7 +252,7 @@
 
 		<h3>[method:null computeVertexNormals]( [page:Boolean areaWeighted] )</h3>
 		<div>
-		areaWeighted - If true the contributution of each face normal to the vertex normal is weighted by the area of the face. Default is true.
+		areaWeighted - If true the contribution of each face normal to the vertex normal is weighted by the area of the face. Default is true.
 		</div>
 		<div>
 		Computes vertex normals by averaging face normals.<br />