Editorial: remove outdated reference (typedarray)

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=28569

Author: zcorpan

geometry/Overview.bs

@@ -1007,11 +1007,11 @@ The following methods do not modify the current matrix.
   </dd>
   <dt><dfn>toFloat32Array()</dfn></dt>
   <dd>
-    Returns the serialized 16 elements <a attribute>m11</a> to <a attribute>m44</a> of the current matrix in column-major order as <a interface>Float32Array</a> [[typedarray]].
+    Returns the serialized 16 elements <a attribute>m11</a> to <a attribute>m44</a> of the current matrix in column-major order as <a interface>Float32Array</a>.
   </dd>
   <dt><dfn>toFloat64Array()</dfn></dt>
   <dd>
-    Returns the serialized 16 elements <a attribute>m11</a> to <a attribute>m44</a> of the current matrix in column-major order as <a interface>Float64Array</a> [[typedarray]].
+    Returns the serialized 16 elements <a attribute>m11</a> to <a attribute>m44</a> of the current matrix in column-major order as <a interface>Float64Array</a>.
   </dd>
   <dt><dfn>stringifier()</dfn></dt>
   <dd>