Update BufferGeometry.html

fixes typo

docs/api/core/BufferGeometry.html

@@ -21,7 +21,7 @@
 
 		<h3>[name]()</h3>
 		<div>
-		This creates a new [name]. It also sets several properties to an default value.
+		This creates a new [name]. It also sets several properties to a default value.
 		</div>